Comprehensive analysis on isotopes coming from FUK as sent to me from Helen. Fuel melting accidents release more than 200 different radioactive substances, of which the following 54 are among the most dangerous. CANDU safety analyses routinely restrict themselves to only a small handful of these: iodine, the inert gases krypton and xenon, and, in some cases, cesium -- all released before melting actually begins. The table is adapted from Appendix VI of WASH-1400 (the 1974 Reactor Safety Study, commonly known as the Rasmussen Report); only the manner of expression for units of radioactivity and time has been altered; the information is otherwise identical. [comments by Dr. Gordon Edwards] TABLE VI 3-1 INITIAL ACTIVITY OF RADIONUCLIDES IN THE NUCLEAR REACTOR CORE AT THE TIME OF THE HYPOTHETICAL ACCIDENT Radioactive Inventory No. Radionuclide (Source Term in curies) Half Life == ============ ======================== ========== 1 Cobalt-58 780 thousand 10.1 weeks 2 Cobalt-60 290 thousand 5.25 years 3 Krypton-85 560 thousand 10.8 years 4 Krypton-85m 24 million 4.4 hours 5 Krypton-87 47 million 1.25 hours 6 Krypton-88 68 million 2.8 hours 7 Rubidium-86 26 thousand 2.67 weeks 8 Strontium-89 94 million 7.4 weeks 9 Strontium-90 3 million 700 thousand 30.2 years 10 Strontium-91 110 million 9.7 hours 11 Yttrium-90 390 thousand 2.67 days 12 Yttrium-91 120 million 8.4 weeks 13 Zirconium-95 150 million 9.3 weeks 14 Zirconium-97 150 million 17.0 hours 15 Niobium-95 150 million 5.0 weeks 16 Molybdenum-99 160 million 2.8 days 17 Technetium-99m 140 million 6.0 hours 18 Ruthenium-103 110 million 5.64 weeks 19 Ruthenium-105 72 million 4.44 hours 20 Ruthenium-106 25 million 1.0 years 21 Rhodium-105 49 million 1.50 days 22 Tellurium-127 5 million 900 thousand 9.38 hours 23 Tellurium-127m 1 million 100 thousand 15.6 weeks 24 Tellurium-129 31 million 1.15 hours 25 Tellurium-129m 5 million 300 thousand 8.16 hours 26 Tellurium-131m 13 million 1.25 days 27 Tellurium-132 120 million 3.25 days 28 Antimony-127 6 million 100 thousand 3.88 days 29 Antimony-129 33 million 4.30 hours 30 Iodine-131 85 million 8.05 days 31 Iodine-132 120 million 2.30 hours 32 Iodine-133 170 million 21.0 hours 33 Iodine-134 190 million 53 minutes 34 Iodine-135 150 million 6.72 hours 35 Xenon-133 170 million 5.28 days 36 Xenon-135 34 million 9.2 hours 37 Cesium-134 7 million 500 thousand 2.05 years 38 Cesium-136 3 million 13.0 days 39 Cesium-137 4 million 700 thousand 30.1 years 40 Barium-140 160 million 12.8 days 41 Lanthanum-14 0 160 million 1.67 days 42 Cerium-141 150 million 4.6 weeks 43 Cerium-143 130 million 1.38 days 44 Cerium-144 85 million 40.6 weeks 45 Praseodymium-143 130 million 13.7 days 46 Neodymium-147 60 million 11.1 days 47 Neptunium-239 1 billion 640 million 2.35 days 48 Plutonium-238 57 thousand 89.0 years 49 Plutonium-239 21 thousand 24,000 years 50 Plutonium-240 21 thousand 6,571 years 51 Plutonium-241 3 million 400 thousand 14.6 years 52 Americium-241 1 thousand 7 hundred 410.7 years 53 Curium-242 500 thousand 23.3 weeks 54 Curium-244 23 thousand 18.1 years
Posted on: Mon, 20 Jan 2014 06:04:42 +0000
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