y, ORENSTEIN . ie ark ee c Ge 5 a : nT oT eet Site. These were Castie 1934. ee et Redwing - 19596, and Maxgtack - 195°. MATERIALS AND METHODS Te v.site to the islands were made possible by the coepecsaticn of Task Forse 7.1 and the Trust Territory of the Mited S:ates. Two to five-man teans were flown to the :t.ands to collect samples which were refrigerated. to *he Eniwetok Marine Biological Laboratory, Berchea, driad. ceturned A&rseected, pacxaged and then sent to the Laboratory of RAGiation Stology, Sing an4¢ ana.ysis. Seattle, Washington. for further proces- The samples were prepared on 1.5-.1nch stainless steel planchets and counted for cross beta radioactivity in et*‘er cne of two counting systems operated in the Geiger~M™mlier window region: (a} - .¢ an® cne-halfeinch end- ws tem ‘pancake type Antomtube im a j-inch leac Anton shicld connected to a Nuclear Chicago Model 181 scaler and equ. oped with an automatic sample changer. This system has @ Ceckscounc of apout 13 counts per minute and an efficiency -f iporomimetely whoo 4 oo .8 .ot i2 per cent based on «40 | (o} An internal cThasber continuously fiushed with methane in 2 Counter Laboratory Wucleometer Mark 9, Model 3.. ay oe