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Five radioactive iodine isotopes are described, three of which are new. These were produced, by use of 8 Mev deuterons, 16 Mev helium ions and neutrons. Evidence is presented for the following isotopic assignments and properties: Reaction Half-Life Particle Range grams/ cm 2 Al Gamma—Half-Thickness grams/ cm 2 Pb I 127 ( n , γ ) I 128 25±1 min. (-) 1.05 3.5 Te 128 ( d , 2 n ) I 128 I 127 ( n , 2 n ) I 126 13.0±0.3 days (-) 0.44 4.5 Sb 123 ( α , n ) I 126 Te 125 ( d , n ) I 126 Sb 121 ( α , n ) I 124 4.0±0.3 days (+) — — Te 128 or 130 ( d , n ) 8.0±0.2 days (-) 0.50 3.3 I 1 2 9 o r 1 3 1 Te 130 ( d , 2 n ) I 130 12.6±1.0 hr. (-) 0.40 6.0 It is shown that the 8-day activity is also produced by the radioactive decay of Te 1 2 9 o r 1 3 1 . Chemical identification has been made in every case. A table of approximate yields is given.
Physical Review – American Physical Society (APS)
Published: Nov 15, 1938
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