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A short-lived iodine which was discovered by Strassmann and Hahn as a U fission product was shown to have a half-life of 86± 1 seconds. It emits 6.S-Mev beta-rays and 2.9-Mev gamma-rays. The fission yields in U23., PU 239 , and U233 are 3.1 percent, 1.9 percent, and 1.7 percent, respectively. A mass assignment to 136 has been shown to be the most likely one. The observed 86-sec. I activity does not originate from a Te parent whose half-life is greater than 20 seconds. 11 This method is a modification of a procedure used previously to measure the U 231i fission yield of 6.7-hr.

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