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Atoms are tiny particles in the molecules that make up gases, liquids, and solids. Atoms are made up of three particles, called protons, neutrons, and electrons. An atom has a nucleus (or core) containing protons and neutrons, which is surrounded by electrons. Protons carry a positive electrical charge, and electrons carry a negative electrical charge. Neutrons do not have an electrical charge. Enormous energy is present in the bonds that hold the nucleus together. This nuclear energy can be released when those bonds are broken. The bonds can be broken through nuclear fission, and this energy can be used to produce (generate) electricity.
In nuclear fission, atoms are split apart, which releases energy. All nuclear power plants use nuclear fission, and most nuclear power plants use uranium atoms. During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation. More neutrons are also released when a uranium atom splits. These neutrons continue to collide with other uranium atoms, and the process repeats itself over and over again. This process is called a nuclear chain reaction. This reaction is controlled in nuclear power plant reactors to produce the desired amount of heat.
Nuclear energy can also be released in nuclear fusion, where atoms are combined or fused together to form a larger atom. Fusion is the source of energy in the sun and stars. Developing technology to harness nuclear fusion as a source of energy for heat and electricity generation is the subject of ongoing research, but whether it will be a commercially viable technology is not yet clear because of the difficulty in controlling a fusion reaction.
Uranium is the fuel most widely used by nuclear plants for nuclear fission. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart. Although uranium is about 100 times more common than silver, U-235 is relatively rare.
The Nuclear Suppliers Group (NSG) is a group of nuclear supplier countries that seeks to contribute to the non-proliferation of nuclear weapons through the implementation of two sets of Guidelines for nuclear exports and nuclear-related exports.
The Gateway for Accelerated Innovation in Nuclear (GAIN) announced December 19 that seven firms will get vouchers to access the nuclear research facilities and expertise of the national laboratory complex in the first round of fiscal year awards. Each company is paired with one or more national laboratories to work on concepts from advanced reactor fueling to fuel recycling to climate forecasting.
The NWPA assigns the Department of Energy (DOE) the responsibility to site, build, and operate a deep geologic repository for the disposal of high-level waste and spent nuclear fuel. It directs EPA to develop standards for protection of the general environment from offsite releases of radioactive material in repositories. The Act directs the Nuclear Regulatory Commission (NRC) to license DOE to operate a repository only if it meets EPA's standards and all other relevant requirements.
Nuclear medicine is a medical specialty that uses radioactive tracers (radiopharmaceuticals) to assess bodily functions and to diagnose and treat disease. Specially designed cameras allow doctors to track the path of these radioactive tracers. Single Photon Emission Computed Tomography or SPECT and Positron Emission Tomography or PET scans are the two most common imaging modalities in nuclear medicine.
For most diagnostic studies in nuclear medicine, the radioactive tracer is administered to a patient by intravenous injection. However a radioactive tracer may also be administered by inhalation, by oral ingestion, or by direct injection into an organ. The mode of tracer administration will depend on the disease process that is to be studied.
The total radiation dose conferred to patients by the majority of radiopharmaceuticals used in diagnostic nuclear medicine studies is no more than what is conferred during routine chest x-rays or CT exams. There are legitimate concerns about possible cancer induction even by low levels of radiation exposure from cumulative medical imaging examinations, but this risk is accepted to be quite small in contrast to the expected benefit derived from a medically needed diagnostic imaging study.
Like radiologists, nuclear medicine physicians are strongly committed to keeping radiation exposure to patients as low as possible, giving the least amount of radiotracer needed to provide a diagnostically useful examination.
The Convention on Nuclear Safety (CNS) aims to commit Contracting Parties operating land-based civil nuclear power plants to maintain a high level of safety by establishing fundamental safety principles to which States would subscribe.
Founded in 2007, the program has quickly risen to a place of national prominence. While delivering a traditional nuclear engineering core curriculum, the program emphasizes the nuclear fuel life cycle (including fuel exploration and processing), nuclear power systems production, design and operation, fuel recycling, storage and waste remediation, radiation detection and radiation damage, as well as the policy issues surrounding each of these activities. Related research is conducted in the Nuclear Science and Engineering Center.
Students in all three nuclear engineering degree programs are exposed to a broad systems overview of the complete nuclear fuel cycle as well as having detailed expertise in a particular component of the cycle. Breadth is assured by requiring all students to complete a rigorous set of core courses.
Founded in 2007, the program has quickly risen to place of national prominence. While delivering a traditional nuclear engineering core curriculum, the program emphasizes the nuclear fuel life cycle, including fuel exploration and processing, nuclear power systems production, design and operation, fuel recycling, storage and waste remediation, radiation detection and radiation damage, as well as the policy issues surrounding each of these activities. Related research is conducted in the Nuclear Science and Engineering Center.
Named after pioneering physicist and Nobel Prize laureate Marie Sklodowska-Curie, the international program aims to help grow the number of women in the nuclear field, supporting an inclusive workforce of both men and women who contribute to and drive global scientific and technological innovation. More
President Obama in his Prague remarks identified the risk of nuclear terrorism as the most immediate and extreme threat to global security, and he called for a worldwide effort to secure all vulnerable nuclear materials in four years. He also highlighted the need to break up black markets, detect and intercept materials in transit, and use financial tools to disrupt illicit trade in nuclear materials.
It is almost impossible to quantify the likelihood of nuclear attack by extremist groups. But we know that roughly 2000 metric tons of nuclear weapons usable materials -- highly enriched uranium and separated plutonium -- are present in both civilian and military programs, and we know that terrorists have the intent and the capability to turn these materials into a nuclear device if they were to gain access to them. A terrorist attack with an improvised nuclear device would create political, economic, social, psychological, and environmental havoc around the world, no matter where the attack occurs. The threat is global, the impact of a nuclear terrorist attack would be global, and the solutions therefore must be global.
Across the four Nuclear Security Summits, we have created and maintained increased momentum of tangible actions to reduce the threat of nuclear terrorism and to make progress towards strengthened international norms and standards for nuclear security.
The Summits were designed to enhance, elevate, expand and empower this architecture of treaties, institutions, norms and practices to effectively address the threats we face today and in the future. As the 2016 Nuclear Security Summit represented the last summit in this format, we have issued five Action Plans in support of the key enduring institutions and initiatives related to nuclear security: the UN, the IAEA, INTERPOL, the GICNT and the Global Partnership. These Action Plans represent steps the Summit participants will take as members of these organizations to support their future development as well as highlight our ambitions for their enhanced role in nuclear security. The activities outlined in these plans will lead to a strengthened global nuclear security architecture poised to address future challenges and threats to security worldwide.
FEMA's Radiological Emergency Preparedness Program ensures that the health and safety of citizens living around commercial nuclear power plants is adequately protected in the event of a nuclear power plant accident and informs and educates the public about radiological emergency preparedness.
The NWTRB is an independent agency whose sole purpose is to provide independent scientific and technical oversight of the Department of Energy's program for managing and disposing of high-level radioactive waste and spent nuclear fuel.
The U.S. must have the ability to determine those responsible for nuclear smuggling, as well as attacks, both executed and planned. This is based on fusing intelligence, law enforcement, and nuclear forensics information. Nuclear forensics serves as the technical component of our capability to attribute nuclear events. As such, it is a keystone of the U.S. policy "to hold fully accountable any state, terrorist group, or other non-state actor that supports or enables terrorist efforts to obtain or use weapons of mass destruction." (Nuclear Posture Review Report, April 2010)
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