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As of 2018, JT-60 holds the record for the highest value of the fusion triple product achieved: 1.77 × 10 28 K·s·m −3 = 1.53 × 10 21 keV·s·m −3. [ 4 ] [ 5 ] To date, JT-60 has the world record for the hottest ion temperature ever achieved (522 million °C); this record defeated the TFTR machine at Princeton in 1996.
In a fission nuclear reactor, uranium-238 can be used to generate plutonium-239, which itself can be used in a nuclear weapon or as a nuclear-reactor fuel supply. In a typical nuclear reactor, up to one-third of the generated power comes from the fission of 239 Pu, which is not supplied as a fuel to the reactor, but rather, produced from 238 U. [5] A certain amount of production of 239
[3] [4]: 39 It is produced artificially in nuclear reactors. Deliberate industrial production depends on neutron activation of bulk samples of the monoisotopic and mononuclidic cobalt isotope 59 Co. [5] Measurable quantities are also produced as a by-product of typical nuclear power plant operation and may be detected externally when leaks occur.
[1] [page needed] In conjunction with the neutron flux, it enables the calculation of the reaction rate, for example to derive the thermal power of a nuclear power plant. The standard unit for measuring the cross section is the barn, which is equal to 10 −28 m 2 or 10 −24 cm 2. The larger the neutron cross section, the more likely a neutron ...
[1] [2] The concept of a nuclear cross section can be quantified physically in terms of "characteristic area" where a larger area means a larger probability of interaction. The standard unit for measuring a nuclear cross section (denoted as σ) is the barn, which is equal to 10 −28 m 2, 10 −24 cm 2 or 100 fm 2.
The core thermal power was 626 MWt. The reactor vessel was rated to 1015 psia and measured 12 feet 2 inches (3.71 m) diameter and 42 feet (13 m) tall. Dresden 1 Nuclear Flow Diagram featured a secondary steam generator for load following. The reactor featured a dual cycle, with steam coming from both the stream drum and steam generators.
Natural samarium has a radioactivity of 127 Bq/g, mostly due to 147 Sm, [66] which alpha decays to 143 Nd with a half-life of 1.06 × 10 11 years and is used in samarium–neodymium dating. [67] [68] 146 Sm is an extinct radionuclide, with the half-life of 9.20 × 10 7 years. [10]
Nuclear medicine (nuclear radiology, nucleology), [1] [2] is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear imaging is, in a sense, radiology done inside out , because it records radiation emitted from within the body rather than radiation that is transmitted through ...