(2) development of scintillation spectrometry; (3) characterization of short period nuclear isomers; (4).measurement of the neutron lifetime. For chemistry, Dr. Swartout cited (1) development of a separation method for rare gases based on Low | temperature adsorption; (2) development of fused fluoride systems; (3) development: of ion exchange separations; (4) recent work on the characterization of tin isotopes, interpreted in terns of nuclear shell schemes. | In biclogy, the effect of oxygen pressure on radiation damage and the finding that the radiation mutation rate of mice is ten times that expected from work on drosophila were mentioned. This portion of the Session was concluded at 5:15 p.m., and the meeting continued with a brief executive session. The First Session was adjourned at 5:40 p.m, SECOND SESSION (March 15, 1951) At 9:05 p.m. the Committee met with Commissioner Smyth. The discussion concerned the over-all reactor situation, with special reference to three AEC documents on this subject: AEC 152/15, AEC 17/26, and the onapp-to-Hafstad memorandum of February 28, 1951 entitled "Commission Action on AEC 152/15", Dr. Smyth stated the aims of the Commission to be: first, the pro- duction of the most explosive, e.g. plutonium, from a given amount of ore; second, the generation of useful power. He mentioned the negotiations with ru eRe my ce ast Bot Degen 8 . : a hay. a Pong he bBo il oe _ Reactor Program

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