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79Se is a radioisotope of selenium present in spent nuclear fuel and the wastes resulting from reprocessing this fuel. It is one of only 7 long-lived fission products. Its yield is low (about 0.04%) as it it is near the lower end of the mass range for fission products. Its halflife has been variously reported as 650,000 years, 65,000 years, 1.13 million years, 480,000 years, and most recently, 295,000 years.
Additional recommended knowledge
Se-79 decays by emitting a beta particle with no attendant gamma radiation. The low specific activity and relatively low energy of its beta particle limits the radioactive hazards of this isotope.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Selenium-79". A list of authors is available in Wikipedia.|