The counting procedure is descrided in Section C below. samples were counted on a gold foil covered Q-gas flow counter o diameter and 10" active length. The geometry factor for the pos was maintained between the counter and the sample was previqualy with use of a similarly mounted sample of KCl and was found to The activities in the two samples were followed for over 10 activity on the neodymium sample decayed from an initial rate of with a constant half life of 61 + 1 hours into a very long lived cpm. An aluminum absorption curve for the same sample de few hours after milking was found to be absolutely straight to 3 and gave a balf thickness value of 133 mgfom. When the y2 activity was subtracted out, the aluminum abso tion curve for the strontium sample, which was also determined soon after ing, also was a straight line as far as 40 mg/en’. was 12.0 The half thickness val mg/cm. The intensities and identity of the activities in the strontium and neodymium samples corrected to milking time were as follows: y7 activity, cpm BO activity, cpm Strontium Sample 263 1068 Neodymium Sample 4540 102 Applying the Libby equation, 10453295 UNCLASSIFIED ar LANL