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The isotope selenium-75 has radiopharmaceutical uses. For example, it is used in high-dose-rate endorectal brachytherapy, as an alternative to iridium-192. [8]In paleobiogeochemistry, the ratio in amount of selenium-82 to selenium-76 (i.e, the value of δ 82/76 Se) can be used to track down the redox conditions on Earth during the Neoproterozoic era in order to gain a deeper understanding of ...
Selenium also has numerous unstable synthetic isotopes ranging from 64 Se to 95 Se; the most stable are 75 Se with a half-life of 119.78 days and 72 Se with a half-life of 8.4 days. [21]
Selenium-79 is a radioisotope of selenium present in spent nuclear fuel and the wastes resulting from reprocessing this fuel. It is one of only seven long-lived fission products . Its fission yield is low (about 0.04%), as it is near the lower end of the mass range for fission products .
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds. [1]
Selenium is a component of the amino acids selenocysteine and selenomethionine. In humans, selenium is a trace element nutrient that functions as cofactor for glutathione peroxidases and certain forms of thioredoxin reductase. [1] Selenium-containing proteins are produced from inorganic selenium via the intermediacy of selenophosphate (PSeO 3 3 ...
The Los Angeles County refinery was ranked as the top emitter of nitrogen and selenium among 81 oil facilities in 2021, a recent study found. Study of U.S. oil refineries ranks Chevron El Segundo ...
She shares her simple tips for a long life. At 104, she continues lobstering and vows never to retire. Woman, 104, still works trapping lobsters, shares simple tips for a long life
A capsule containing radiolabelled 75 SeHCAT (with 370 kBq of Selenium-75 and less than 0.1 mg SeHCAT) is taken orally with water, to ensure passage of the capsule into the gastrointestinal tract. The physical half life of 75 Se is approximately 118 days; activity is adjusted to a standard reference date. [citation needed]