During my first year at Lamont, Professor Kulp got the idea that we should see if we could detect one of the A bomb fission products that remained airborne instead of being purged by rainfall. In particular, he focused on an isotope of the inert gas krypton, 85Kr, with a half life of about 10 years. Much of that produced by the Alamogordo, Hiroshima and Nagasaki A bombs (Fig. 5) would not yet have undergone radio decay. Further, during the seven or so years that had elapsed since these explosions took place, the 85Kr would have...

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