Fon the dead organic matter of the dry leaf base. It is to be interpreted ed material having fallen on the plant, rather than absorbed material HE fee ne translocated to this site. ¢ explosions at Eniwetok occurred above the islands rather than over water as was the case for the Bikini tests. For this reason, additional Foremost among these was the possibility of sing formed by the n-y reaction of ca**, Ca** has a relative abundance in approximately 2 per cent. A:careful examination of the plants growing closest to the crater revealed sence of a disturbance closely resembling calcium deficiency as it is x ‘ in the laboratory by withholding calcium’ from the nutrient solution. A tive hypothesis was then formed, that if cat> were present, it would tend to in highest concentrations in those tissues which first showed breakdown r calcium deficiency. This would then explain tissue breakdown which & led calcium deficiency, but was due to radiation damage by ca*® : For this study Portulaca oleracea plants were taken at different distances z gaway from the bomb crater to a distance of one thousand yards where . Samples of coral sand were taken from the soil surface layer, and from fand six-inch depths, to correspond with the plants collected at a dis- oftwo hundred yards from the crater. from all other elements-—-——---~ Both the coral sand and the plant -- ae The possible formation of cats from ca*4 by the n-y reaction: me'l Kg u 5 with 1% fission i.e., 10 gms fission v&28'x10°2em, atoms = 4,25 x 10°72 x 6 x 102"=2.5 x10 22 atoms mn Agate ICEDRADIOACTIVITY - ENIWETOK TESTS ‘had to be considered. eet This was the highest recordedactivity; it was ee 6 mg.of ash was recorded, On Aitsu an activity of 530, 000 2 leaves at Igurin, Rigili, Bogon,Aitsu. . vs AECD ~3446 Sen originalatoiveionsinneam: « teetinapromerinitsemenophimdyneinenteens sinkeldipatetmi tptragteAeMAIU mr en6 8 ~65-