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Wednesday, June 26, 2019

United States Department of Health and Human Services

From Wikipedia, the free encyclopedia

United States Department of Health & Human Services
Seal of the United States Department of Health and Human Services.svg
Seal of the U.S. Department of Health & Human Services
Flag of the United States Department of Health and Human Services.svg
Flag of the U.S. Department of Health & Human Services
DHHS2 by Matthew Bisanz.JPG
Hubert H. Humphrey Building, Department Headquarters
Department overview
FormedApril 11, 1953; 66 years ago (as Department of Health, Education, and Welfare)
May 4, 1980 (as United States Department of Health & Human Services)
Preceding agencies
JurisdictionFederal government of the United States
HeadquartersHubert H. Humphrey Building
Washington, D.C., U.S.
Employees79,540 (2015)
Department executives
Websitewww.hhs.gov

The United States Department of Health & Human Services (HHS), also known as the Health Department, is a cabinet-level department of the U.S. federal government with the goal of protecting the health of all Americans and providing essential human services. Its motto is "Improving the health, safety, and well-being of America". Before the separate federal Department of Education was created in 1979, it was called the Department of Health, Education, and Welfare (HEW).

HHS is administered by the Secretary of Health and Human Services, who is appointed by the President with the advice and consent of the Senate. The United States Public Health Service (PHS) is the main division of the HHS and is led by the Assistant Secretary for Health. The current Secretary, Alex Azar, assumed office on January 29, 2018, upon his appointment by President Trump and confirmation by the Senate.

The United States Public Health Service Commissioned Corps, the uniformed service of the PHS, is led by the Surgeon General who is responsible for addressing matters concerning public health as authorized by the Secretary or by the Assistant Secretary of Health in addition to his or her primary mission of administering the Commissioned Corps.

History

Federal Security Agency

The Federal Security Agency (FSA) was established on July 1, 1939, under the Reorganization Act of 1939, P.L. 76-19. The objective was to bring together in one agency all federal programs in the fields of health, education, and social security. The first Federal Security Administrator was Paul V. McNutt. The new agency originally consisted of the following major components: (1) Office of the Administrator, (2) Public Health Service (PHS), (3) Office of Education, (4) Civilian Conservation Corps, and (5) Social Security Board. 

By 1953, the Federal Security Agency's programs in health, education, and social security had grown to such importance that its annual budget exceeded the combined budgets of the Departments of Commerce, Justice, Labor and Interior and affected the lives of millions of people. Consequently, in accordance with the Reorganization Act of 1949, President Eisenhower submitted to the Congress on March 12, 1953, Reorganization Plan No. 1 of 1953, which called for the dissolution of the Federal Security Agency and elevation of the agency to Cabinet status as the Department of Health, Education, and Welfare. The plan was approved April 1, 1953, and became effective on April 11, 1953.

Unlike statutes authorizing the creation of other executive departments, the contents of Reorganization Plan No. 1 of 1953 were never properly codified within the United States Code, although Congress did codify a later statute ratifying the Plan. Today, the Plan is included as an appendix to Title 5 of the United States Code. The result is that HHS is the only executive department whose statutory foundation today rests on a confusing combination of several codified and uncodified statutes.

Department of Health, Education, and Welfare

Seal of the U.S. Department of Health, Education, and Welfare
Flag of the U.S. Department of Health, Education, and Welfare
The seal and flag of the U.S. Department of Health, Education, and Welfare
 
The Department of Health, Education, and Welfare (HEW) was created on April 11, 1953, when Reorganization Plan No. 1 of 1953 became effective. HEW thus became the first new Cabinet-level department since the Department of Labor was created in 1913. The Reorganization Plan abolished the FSA and transferred all of its functions to the Secretary of HEW and all components of the Agency to the Department. The first Secretary of HEW was Oveta Culp Hobby, a native of Texas, who had served as Commander of the Women's Army Corps in World War II and was editor and publisher of the Houston Post. Sworn in on April 11, 1953, as Secretary, she had been FSA Administrator since January 21, 1953. 

The six major program-operating components of the new Department were the Public Health Service, the Office of Education, the Food and Drug Administration, the Social Security Administration, the Office of Vocational Rehabilitation, and St. Elizabeth's Hospital. The Department was also responsible for three federally aided corporations: Howard University, the American Printing House for the Blind, and the Columbia Institution for the Deaf (Gallaudet College since 1954).

Department of Health & Human Services

The Department of Health, Education, and Welfare was renamed the Department of Health & Human Services (HHS) in 1979, when its education functions were transferred to the newly created United States Department of Education under the Department of Education Organization Act. HHS was left in charge of the Social Security Administration, agencies constituting the Public Health Service, and Family Support Administration. 

In 1995, the Social Security Administration was removed from the Department of Health & Human Services, and established as an independent agency of the executive branch of the United States Government. 

The 2010 United States federal budget established a reserve fund of more than $630 billion over 10 years to finance fundamental reform of the health care system.

Organization

The Department of Health & Human Services is led by the United States Secretary of Health and Human Services, a member of the United States Cabinet appointed by the President of the United States with the consent of the United States Senate. The Secretary is assisted in managing the Department by the Deputy Secretary of Health and Human Services, who is also appointed by the President. The Secretary and Deputy Secretary are further assisted by seven Assistant Secretaries, who serve as top Departmental administrators.

As of Jan. 20, 2018, this is the top level of the organizational chart. HHS provides further organizational detail on its website.

Several agencies within HHS are components of the USPHS or Public Health Service (PHS), as noted below.

Office of Inspector General

The Office of the Inspector General (OIG) investigates criminal activity for HHS. The special agents who work for OIG have the same title series "1811", training and authority as other federal criminal investigators, such as the FBI, ATF, DEA and Secret Service. However, OIG Special Agents have special skills in investigating white collar crime related to Medicare and Medicaid fraud and abuse. Organized crime has dominated the criminal activity relative to this type of fraud. 

HHS-OIG investigates tens of millions of dollars in Medicare fraud each year. In addition, OIG will continue its coverage of all 50 states and the District of Columbia by its multi-agency task forces (PSOC Task Forces) that identify, investigate, and prosecute individuals who willfully avoid payment of their child support obligations under the Child Support Recovery Act. 

HHS-OIG agents also provide protective services to the Secretary of HHS, and other department executives as necessary. 

In 2002, the department released Healthy People 2010, a national strategic initiative for improving the health of Americans. 

With the passage of the Fraud Enforcement and Recovery Act of 2009, and the Affordable Care Act of 2010, the Office of the Inspector General has taken an emboldened stance against healthcare related non-compliance, most notably for violations of Stark Law and the Anti-Kickback Statute.

In 2015, the OIG issued a fraud alert as a warning to hospitals and healthcare systems to monitor and comply with their physician compensation arrangements.

Recent years have seen dramatic increases in both the number and the amounts of Stark Law violation settlements, prompting healthcare experts to identify a need for automated solutions that manage physician arrangements by centralizing necessary information with regard to physician-hospital integration. Contract management software companies such as Meditract provide options for health systems to organize and store physician contracts. Ludi Inc introduced DocTime Log®, an SaaS solution that specifically addresses this growing concern, automating physician time logging in compliance with contract terms to eliminate Stark Law and Anti-Kickback Statute violations.

Former operating divisions and agencies

Relationship with state and local health departments

There are three tiers of health departments, the federal health department, state health department and local health department. In relation with state and local government, the federal government provides states with funding to ensure that states are able to retain current programs and are able to implement new programs. The coordination between all three health departments is critical to ensure the programs being implemented are well structured and suited to the corresponding level of health department. The health department at state level needs to safeguard good relations with legislators as well as governors in order to acquire legal and financial aid to guarantee the development and enhancements of the programs. Assemblies are set up to guide the relationships between state and local health departments. The state sets up the regulations and health policies whereas the local health departments are the ones implementing the health policies and services.

As of 2018, there are ten regional offices that have separated the states in groups of four to eight. These offices directly work with the state departments, local governments, and tribal councils. The directors from each regional office are appointed directly by the active president. The follow is a list of who runs each regional office: 

Region 1: John McGough Region 6: Mervin Turner
Region 2: Dennis González Region 7: Jeff Kahrs
Region 3: Matt Baker Region 8: Brian Shiozawa
Region 4: Renee Ellmers Region 9: Unknown
Region 5: Douglas O' Brien Region 10: John R. Graham

Budget and finances

The Department of Health & Human Services was authorized a budget for fiscal year 2015 of $1.020 trillion. The budget authorization is broken down as follows:

Program Funding (in billions)
Management and Finance
Departmental Management $1.4
Public Health and Social Services Emergency Fund $1.4
Operating Divisions
Food and Drug Administration $2.6
Health Resources and Services Administration $10.4
Indian Health Service $4.8
Centers for Disease Control and Prevention $6.7
National Institutes of Health $30.4
Substance Abuse and Mental Health Services Administration $3.4
Agency for Healthcare Research and Quality $0.4
Centers for Medicare and Medicaid Services $906.8
Administration for Children and Families $51.3
Administration for Community Living $2.1
TOTAL 1,020.3

Programs

The Department of Health & Human Services' administers 115 programs across its 11 operating divisions. The United States Department of Health & Human Services (HHS) aims to "protect the health of all Americans and provide essential human services, especially for those who are least able to help themselves." These federal programs consist of social service programs, civil rights and healthcare privacy programs, disaster preparedness programs, and health related research. HHS offers a variety of social service programs geared toward persons with low income, disabilities, military families, and senior citizens. Healthcare rights are defined under HHS in the Health Insurance Portability and Accountability Act (HIPAA) which protect patient's privacy in regards to medical information, protects workers health insurance when unemployed, and sets guidelines surrounding some health insurance. HHS collaborates with the Office of the Assistant Secretary for Preparedness and Response and Office of Emergency Management to prepare and respond to health emergencies. A broad array of health related research is supported or completed under the HHS; secondarily under HHS, the Health Resources & Service Administration houses data warehouses and makes health data available surrounding a multitude of topics. HHS also has vast offering of health related resources and tools to help educate the public on health policies and pertinent population health information. Some examples of available resources include disease prevention, wellness, health insurance information, as well as links to healthcare providers and facilities, meaningful health related materials, public health and safety information.

Some highlights include:
  • Health and social science research
  • Preventing disease, including immunization services
  • Assuring food and drug safety
  • Medicare (health insurance for elderly and disabled Americans) and Medicaid (health insurance for low-income people)
  • Health information technology
  • Financial assistance and services for low-income families
  • Improving maternal and infant health, including a Nurse Home Visitation to support first-time mothers
  • Head Start (pre-school education and services)
  • Faith-based and community initiatives
  • Preventing child abuse and domestic violence
  • Substance abuse treatment and prevention
  • Services for older Americans, including home-delivered meals
  • Comprehensive health services for Native Americans
  • Assets for Independence
  • Medical preparedness for emergencies, including potential terrorism
  • Child support enforcement

The Health Insurance Portability and Accountability Act (HIPAA)

This program is to ensure the act and accountability of medical professionals to respect and carry-out basic human health rights. In the United States, the government feels that it is essential for the American people to understand their civil duty and rights to all of their medical information. That includes: health insurance policies or medical records from every doctor or emergency visit in one's life. Through Health & Human services one is able to file a complaint that their HIPAA rights have been violated or a consultant that will be able to decide if their rights were violated.

Social Services

This branch has everything to do with the social justice, wellness, and care of all people throughout the United States. This includes but is not limited to people who need government assistance, foster care, unaccompanied alien children, daycares (headstart included), adoption, senior citizens, and disability programs. Social services is one of it not the largest branch of programs underneath it that has a wide variety throughout the United States at a state and local level.

Prevention and Wellness

The prevention and wellness program's main idea is to give the American people the ability to live the healthiest and best lifestyle physically that they can. They are the ones who deal with vaccines and immunizations, which fight from common diseases to deadly ones. The nutrition & fitness program that are the basics of healthy eating and regular exercise. Health screenings & family health history which are crucial in the knowledge of each individual's health and body. A severely important one especially in today's society is mental health & substance abuse in where they help people with mental illness and drug abuse. Lastly, they help with environmental health where people are researching and studying how our environments both physical and metaphorically have a short and long term effect on our health and wellness.

Strengthening Communities Fund

In June 2010, the Department of Health & Human Services created the Strengthening Communities Fund as part of the American Recovery and Reinvestment Act. The fund was appropriated $50 million to be given as grants to organizations in the United States who were engaged in Capacity Building programs. The grants were given to two different types of capacity builders:
  • State, Local and Tribal governments engaged in capacity building: grants will go to state local and tribal governments to equip them with the capacity to more effectively partner with faith-based or non-faith based nonprofit organizations. Capacity building in this program will involve education and outreach that catalyzes more involvement of nonprofit organizations in economic recovery and building up nonprofit organization's abilities to tackle economic problems. State, Local and Tribal governments can receive up to $250,000 in two year grants
  • Nonprofit Social Service Providers engaged in capacity building: they will make grants available to nonprofit organizations who can assist other nonprofit organizations in organizational development, program development, leadership, and evaluations. Nonprofits can receive up to $1 million in two year grants

Biodefense

HHS plays a role in protecting the United States against bioterrorism events. In 2018, HHS released a new National Biodefense Strategy required by passage of the 2016 Biodefense Strategy Act. The Biodefense Strategy required implementation of a biodefense strategy after a 2015 Blue Ribbon Study Panel on Biodefense report found that the 2009 National Strategy for Countering Biological Threats was inadequate in protecting the U.S. The strategy adopted these five central recommendations: creating a single centralized approach to biodefense; implementing an interdisciplinary approach to biodefense that brings together policy makers, scientists, health experts, and academics; drawing up a comprehensive strategy to address human, plant, and animal health; creating a defense against global and domestic biological threats; and creating a proactive policy to combat the misuse and abuse of advanced biotechnology.

HHS also runs the Biodefense Steering Committee, which works with other federal agencies including the Department of State, Department of Defense (DOD), U.S. Food and Drug Administration, Department of Homeland Security (DHS), and the Environmental Protection Agency. HHS specifically oversees Project BioShield, established in 2003 and operating since 2004, and its development and production of genetically based bio-weapons and vaccines. HHS together with DHS are authorized under the Homeland Security Act of 2002 to deploy the weapons and vaccines produced by Project BioShield on the US general public under martial law during "emerging terrorist threats" or public health emergencies. Both HHS and DHS have similar authorities through state-based legislation adopted from Model State Emergency Health Powers Act provisions.

Criticisms and controversies

In 2016, a published US Senate report revealed that several dozen unaccompanied children from Central America, some as young as fourteen years old, were released from custody to traffickers where they were sexually assaulted, starved or forced to work for little or no pay. The HHS sub agency Office of Refugee Resettlement (ORR) released approximately 90,000 unaccompanied children during 2013–2015 but did not track their whereabouts or properly screen families accepting these children.

To prevent similar episodes, the Homeland Security and Health & Human Services Departments signed a memorandum of understanding in 2016, and agreed to establish joint procedures within one year for dealing with unaccompanied migrant children. As of 2018 they have failed to do so. Between October and December 2017, officials from ORR tried to contact 7,635 children and their sponsors. From these calls, officials learned that 6,075 children remained with their sponsors. Twenty-eight had run away, five had been removed from the United States and fifty-two had relocated to live with a non sponsor. However, officials have lost track of 1,475 children. ORR claims it is not legally liable for the safety and status of the children once released from custody.

DHS claims the migrating children are "terror threats", despite all evidence to the contrary. After falsely categorizing people as terror threats, a range of unconstitutional activities can be undertaken by HHS and DHS.

Beyond trafficking and disappearing migrating children, HHS is evidenced to be actively coercing and forcing bio-substances such as antipsychotics on migrating children without consent, and under questionable medical supervision. Medical professionals state that wrongly prescribed antipsychotics are especially dangerous for children, and can cause permanent psychological damage. Medical professionals also state DHS and HHS incarceration and separation policies are likewise causing irreparable mental harm to the children.

Children are also dying in HHS custody. The forced drugging, deaths, and disappearances of migrating Mexican and Central American children might be related to DHS falsely labeling them and their families as 'terror threats' before HHS manages their incarcerations. Despite a federal court order, the DHS separation practices mandated by the Trump administration's "zero-tolerance" policy have not been halted, and HHS has not stopped forcing drugs on the children it incarcerates.

Freedom of Information Act processing performance

In the latest Center for Effective Government analysis of 15 federal agencies which receive the most Freedom of Information Act (United States) (FOIA) requests published in 2015 (using 2012 and 2013 data, the most recent years available), the DHHS ranked second to last, earning an F by scoring 57 out of a possible 100 points, largely due to a low score on its particular disclosure rules. It had deteriorated from a D- in 2013.

Nuclear isomer

From Wikipedia, the free encyclopedia

A nuclear isomer is a metastable state of an atomic nucleus, in which one or more nucleons (protons or neutrons) occupy higher energy levels than in the ground state of the same nucleus. "Metastable" describes nuclei whose excited states have half-lives 100 to 1000 times longer than the half-lives of the excited nuclear states that decay with a "prompt" half life (ordinarily on the order of 10−12 seconds). The term "metastable" is usually restricted to isomers with half-lives of 10−9 seconds or longer. Some references recommend 5 × 10−9 seconds to distinguish the metastable half life from the normal "prompt" gamma emission half life. Occasionally the half-lives are far longer than this and can last minutes, hours, or years.
 
Sometimes, the gamma decay from a metastable state is referred to as isomeric transition, but this process typically resembles shorter-lived gamma decays in all external aspects with the exception of the long-lived nature of the meta-stable parent nuclear isomer. The longer lives of nuclear isomers' metastable states are often due to the larger degree of nuclear spin change which must be involved in their gamma emission to reach the ground state. This high spin change causes these decays to be forbidden transitions and delayed. Delays in emission are caused by low or high available decay energy.

The first nuclear isomer and decay-daughter system (uranium X2/uranium Z, now known as 234m
91
Pa
/234
91
Pa
) was discovered by Otto Hahn in 1921.

Nuclei of nuclear isomers

The nucleus of a nuclear isomer occupies a higher energy state than the non-excited nucleus existing at ground state. In an excited state, one or more of the protons or neutrons in a nucleus occupy a nuclear orbital of higher energy than an available nuclear orbital. These states are analogous to excited states of electrons in atoms. 

When excited atomic states decay, energy is released by fluorescence. In electronic transitions, this process usually involves emission of light near the visible range. The amount of energy released is related to bond-dissociation energy or ionization energy and is usually in the range of a few to few tens of eV per bond. 

However, a much stronger type of binding energy, the nuclear binding energy, is involved in nuclear processes. Due to this, most nuclear excited states decay by gamma ray emission. For example, a well-known nuclear isomer used in various medical procedures is 99m
43
Tc
which decays with a half-life of about 6 hours by emitting a gamma ray of 140 keV of energy; this is close to the energy of medical diagnostic X-rays. 

Nuclear isomers have long half lives because their gamma decay is "forbidden" from the large change in nuclear spin needed to emit a gamma ray. For example, 180m
73
Ta
has a spin of 9 and must gamma decay to 180
73
Ta
with a spin of 1. Similarly, 99m
43
Tc
has a spin of 1/2 and must gamma decay to 99
43
Tc
with a spin of 9/2. 

While most metastable isomers decay through gamma ray emission, they can also decay through internal conversion. During internal conversion, energy of nuclear de-excitation is not emitted as a gamma ray but is instead used to accelerate one of the inner electrons of the atom. These excited electrons then leave at a high speed. This occurs because inner atomic electrons penetrate the nucleus where they are subject to the intense electric fields created when the protons of the nucleus re-arrange in a different way. 

In nuclei which are far from stability in energy even more decay modes are known.

Metastable isomers

Metastable isomers can be produced through nuclear fusion or other nuclear reactions. A nucleus produced this way generally starts its existence in an excited state that relaxes through the emission of one or more gamma rays or conversion electrons. Sometimes the de-excitation does not completely proceed rapidly to the nuclear ground state. This usually occurs when the formation of an intermediate excited state has a spin far different from that of the ground state. Gamma-ray emission is hindered if the spin of the post-emission state varies greatly from that of the emitting state especially if the excitation energy is low. The excited state in this situation is a good candidate to be metastable if there are no other states of intermediate spin with excitation energies less than that of the metastable state. 

Metastable isomers of a particular isotope are usually designated with an "m". This designation is placed after the mass number of the atom; for example, cobalt-58m is abbreviated 58m
27
Co
, where 27 is the atomic number of cobalt. For isotopes with more than one metastable isomer, "indices" are placed after the designation, and the labeling becomes m1, m2, m3, and so on. Increasing indices, m1, m2, etc., correlate with increasing levels of excitation energy stored in each of the isomeric states (e.g., hafnium-178m2 or 178m2
72
Hf
). 

A different kind of metastable nuclear state (isomer) is the fission isomer or shape isomer. Most actinide nuclei in their ground states are not spherical, but rather prolate spheroidal, with an axis of symmetry longer than the other axes similar to an American football or rugby ball. This geometry can result in quantum-mechanical states where the distribution of protons and neutrons is so much further from spherical geometry that de-excitation to the nuclear ground state is strongly hindered. In general, these states either de-excite to the ground state far more slowly than a "usual" excited state, or they undergo spontaneous fission with half-lives of the order of nanoseconds or microseconds—a very short time, but many orders of magnitude longer than the half-life of a more-usual nuclear excited state. Fission isomers are usually denoted with a postscript or superscript "f" rather than "m", so that a fission isomer, e.g. of plutonium-240, is denoted plutonium-240f or 240f
94
Pu
.

Nearly-stable isomers

Most nuclear excited states are very unstable and "immediately" radiate away the extra energy after existing on the order of 10−12 seconds. As a result, the characterization "nuclear isomer" is usually applied only to configurations with half-lives of 10−9 seconds or longer. Quantum mechanics predicts that certain atomic species will possess isomers with unusually long lifetimes even by this stricter standard and have interesting properties. Some nuclear isomers are so long-lived that they are relatively stable and can be produced and observed in quantity.

The most stable nuclear isomer occurring in nature is 180m
73
Ta
which is present in all tantalum samples at about 1 part in 8,300. Its half-life is at least 1015 years, markedly longer than the age of the universe. The low excitation energy of the isomeric state causes both gamma de-excitation to the 180Ta
ground state (which itself is radioactive by beta decay, with a half-life of only 8 hours) and direct beta decay to hafnium or tungsten to be suppressed due to spin mismatches. The origin of this isomer is mysterious, though it is believed to have been formed in supernovae (as are most other heavy elements). Were it to relax to its ground state, it would release a photon with a photon energy of 75 keV

It was first reported in 1988 by Collins that 180mTa
can be forced to release its energy by weaker X-rays. This way of de-excitation had never been observed; however, the de-excitation of 180mTa
via resonant photo-excitation of intermediate high levels of this nucleus (E~1 MeV) was found in 1999 by Belic and co-workers in the Stuttgart nuclear physics group.

178m2
72
Hf
is another reasonably stable nuclear isomer which possesses a half-life of 31 years and the highest excitation energy of any comparably long-lived isomer. One gram of pure 178m2Hf
contains approximately 1.33 gigajoules of energy, the equivalent of exploding about 315 kg (694 lb) of TNT. In the natural decay of 178m2Hf
, the energy is released as gamma rays with a total energy of 2.45 MeV. As with 180mTa
, there are disputed reports that 178m2Hf
can be stimulated into releasing its energy. Due to this, the substance is being studied as a possible source for gamma ray lasers. These reports indicate that the energy is released very quickly, so that 178m2Hf
can produce extremely high powers (on the order of exawatts). Other isomers have also been investigated as possible media for gamma-ray stimulated emission.

Holmium's nuclear isomer, 166m1
67
Ho
has a half-life of 1,200 years, which is nearly the longest half-life of any holmium radionuclide. Only 163Ho
, with a half-life of 4,570 years, is longer. 

229
90
Th
has a remarkably low-lying metastable isomer, estimated at only 7.8±0.5 eV above the ground state. After years of failure and one notable false alarm, this decay was directly observed in 2016, producing a gamma ray (defined by its origin, not its wavelength) in the ultraviolet range. The observed energy was between 6.3 and 18.3 eV (200–70 nm). The range is broad because the experiment was optimized for detection rather than precision measurement.

High spin suppression of decay

The most common mechanism for suppression of gamma decay of excited nuclei, and thus the existence of a metastable isomer, is lack of a decay route for the excited state that will change nuclear angular momentum along any given direction by the most common amount of 1 quantum unit ħ in the spin angular momentum. This change is necessary to emit a gamma photon which has a spin of 1 unit in this system. Integral changes of 2, 3, 4, and more units in angular momentum are possible, but the emitted photons carry off the additional angular momentum. Changes of more than 1 unit are known as forbidden transitions. Each additional unit of spin change larger than 1 that the emitted gamma ray must carry inhibits decay rate by about 5 orders of magnitude. The highest known spin change of 8 units occurs in the decay of 180mTa, which suppresses its decay by a factor of 1035 from that associated with 1 unit. Instead of a natural gamma decay half life of 10−12 seconds, it has a half life of more than 1023 seconds, or at least 3 × 1015 years, and thus has yet to be observed to decay. 

Gamma emission is impossible when the nucleus begins in a zero-spin state, as such an emission would not conserve angular momentum.

Applications

Hafnium and tantalum isomers have been considered in some quarters as weapons that could be used to circumvent the Nuclear Non-Proliferation Treaty, since it is claimed they can be induced to emit very strong gamma radiation. This claim is generally discounted. DARPA has (or had) a program to investigate this use of both nuclear isomers. The potential to trigger an abrupt release of energy from nuclear isotopes, a prerequisite to their use in such weapons, is disputed. Nonetheless a 12-member Hafnium Isomer Production Panel (HIPP) was created to assess means of mass-producing the isotope.

Technetium isomers 99m
43
Tc
(with a half-life of 6.01 hours) and 95m
43
Tc
(with a half-life of 61 days) are used in medical and industrial applications.

Nuclear batteries

Nuclear decay pathways for the conversion of lutetium-177m to hafnium-177
 
Nuclear batteries use small amounts (milligrams and microcuries) of radioisotopes with high energy densities. In one design, radioactive material sits atop a device with adjacent layers of P-type and N-type silicon. Ionizing radiation directly penetrates the junction and creates electron-hole pairs. Nuclear isomers could replace other isotopes, and with further development, it may be possible to turn them on and off by triggering decay as needed. Current candidates for such use include 108Ag, 166Ho, 177Lu, and 241Am. As of 2004 the only isomer which had been successfully triggered was 180mTa which required more photon energy to trigger than was released.

An isotope such as 177Lu releases gamma rays by decay through a series of internal energy levels within the nucleus, and it is thought that by learning the triggering cross sections with sufficient accuracy, it may be possible to create energy stores that are 106 times more concentrated than high explosive or other traditional chemical energy storage.

Decay processes

An isomeric transition (IT) is the decay of a nuclear isomer to a lower-energy nuclear state. This radioactive decay process involves emission of a gamma ray. The actual process can have two effects:
  • γ (gamma) emission (emission of a high-energy photon)
  • internal conversion (the energy is used to excite the atom's electrons)
Isomers may decay into other elements, though the rate of decay may differ between isomers. For example, 177mLu can beta decay to 177Hf with a half-life of 160.4 d, or it can undergo isomeric transition to 177Lu with a half-life of 160.4 d which then beta decays to 177Hf with a half-life of 6.68 d.

The emission of a gamma ray from an excited nuclear state allows the nucleus to lose energy and reach a lower energy state, sometimes its ground state. In certain cases, the excited nuclear state following a nuclear reaction or other type of radioactive decay can become a metastable nuclear excited state. Some nuclei are able to stay in this metastable excited state for minutes, hours, days, or occasionally far longer, before undergoing gamma decay, in which they emit a gamma ray. 

The process of isomeric transition is similar to any gamma emission from any excited nuclear state, but differs by involving excited metastable states of nuclei with longer half lives. These states are created, as all nuclei that undergo gamma radioactive decay, following the emission of an alpha particle, beta particle, or occasionally other types of particles that leave the nucleus in an excited state. 

The gamma ray may transfer its energy directly to one of the most tightly bound electrons causing that electron to be ejected from the atom, a process termed the photoelectric effect. This should not be confused with the internal conversion process, in which no gamma ray photon is produced as an intermediate particle.

Property is theft!

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