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The high short-term radioactivity of spent nuclear fuel is primarily from fission products with short half-life.The radioactivity in the fission product mixture is mostly due to short-lived isotopes such as 131 I and 140 Ba, after about four months 141 Ce, 95 Zr/ 95 Nb and 89 Sr constitute the largest contributors, while after about two or three years the largest share is taken by 144 Ce/ 144 ...
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]
The longest-lived radioisotope is 14 C, with a half-life of 5.70(3) × 10 3 years. This is also the only carbon radioisotope found in nature, as trace quantities are formed cosmogenically by the reaction 14 N + n → 14 C + 1 H. The most stable artificial radioisotope is 11 C, which has a half-life of 20.3402(53) min. All other radioisotopes ...
For three elements (indium, tellurium, and rhenium) a very long-lived radioactive primordial nuclide is more abundant than a stable nuclide. The longest-lived radionuclide known, 128 Te, has a half-life of 2.2 × 10 24 years: 1.6 × 10 14 times the age of the Universe. Only four of these 35 nuclides have half-lives shorter than, or equal to ...
The longest-lived radioisotopes are 135 Cs with a half-life of 1.33 million years, 137 Cs with a half-life of 30.1671 years and 134 Cs with a half-life of 2.0652 years. [6] All other isotopes have half-lives less than 2 weeks, most under an hour.
The longest-lived artificial radioisotope of tellurium is 121 Te with a half-life of about 19 days. Several nuclear isomers have longer half-lives, the longest being 121m Te with a half-life of 154 days. The very-long-lived radioisotopes 128 Te and 130 Te are the two most common isotopes of tellurium.
The longest-lived radioisotope is 73 As with a half-life of 80 days. List of isotopes. Nuclide [n 1] Z N Isotopic mass [4] [n 2] [n 3] Half-life [1] Decay mode [1]
129 I is one of the seven long-lived fission products that are produced in significant amounts. Its yield is 0.706% per fission of 235 U. [7] Larger proportions of other iodine isotopes such as 131 I are produced, but because these all have short half-lives, iodine in cooled spent nuclear fuel consists of about 5/6 129 I and 1/6 the only stable iodine isotope, 127 I.