- long half-life isotopes
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English-Bulgarian polytechnical dictionary . 2013.
long half-life isotopes
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Long-lived fission product — Long lived fission products are radioactive materials with a long half life (more than 200,000 years) produced by nuclear fission. Contents 1 Evolution of radioactivity in nuclear waste 1.1 Short term 1.2 Medium lived fission products … Wikipedia
Isotopes of caesium — Caesium (Cs) has 40 known isotopes. The atomic masses of these isotopes range from 112 to 151. Only one isotope, 133Cs, is stable. The longest lived radioisotopes are 135Cs with a half life of 2.3 million years, 137Cs with a half life of 30.1671… … Wikipedia
Isotopes of nickel — Naturally occurring nickel (Ni) is composed of five stable isotopes; 58 Ni, 60 Ni, 61 Ni … Wikipedia
Isotopes of osmium — Osmium (Os) has seven naturally occurring isotopes, 6 of which are stable: 184Os, 187Os, 188Os, 189Os, 190Os, and (most abundant) 192Os. The other one, 186Os, has an extremely long half life (2×1015 years) and for practical purposes can be… … Wikipedia
Isotopes of cadmium — Naturally occurring cadmium (Cd) is composed of 8 isotopes. For two of them, natural radioactivity was observed, and three others are predicted to be radioactive but their decays were never observed, due to extremely long half life times. The two … Wikipedia
Isotopes of sodium — There are thirteen recognized isotopes of sodium. 23Na is the only stable isotope. As such, it is considered a monoisotopic element and it has a standard atomic mass: 22.98976928(2) u. Sodium has two radioactive cosmogenic isotopes (22Na, half… … Wikipedia
Isotopes of iron — Naturally occurring iron (Fe) consists of four isotopes: 5.845% of radioactive 54Fe (half life: >3.1 times;1022 years), 91.754% of stable 56Fe, 2.119% of stable 57Fe and 0.282% of stable 58Fe.60Fe is an extinct radionuclide of long half life (1.5 … Wikipedia
Isotopes of rhenium — Naturally occurring rhenium (Re) is 37.4% 185Re, which is stable, and 62.6% 187Re, which is unstable but has a very long half life. There are twenty six other unstable isotopes recognized. Standard atomic mass: 186.207(1) u Table Notes * Values… … Wikipedia
Isotopes of selenium — Selenium (Se) has six naturally occurring isotopes, five of which are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. The last three also occur as fission products, along with 79Se which has a halflife of 295,000 years, and 82Se which has a very long… … Wikipedia
Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… … Universalium
Isotopes of neptunium — Neptunium (Np) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 239Np in 1940, produced by bombarding 238U with neutrons to … Wikipedia
