THE cæ;sium-137 γ-activity of 10 lambs, which had been used previously to investigate some relationships between potassium-40 content and composition1, was measured concurrently with potassium-40 γ-activity on the Los Alamos human counter2. The lambs averaged 88 lb. in live-weight and were purchased from a feed-lot at La Jara, in southern Colorado, in March 1960. The counting conditions have been described earlier1. The γ-counts from the upper and lower channel settings were entered on I.B.M. cards, and a computer tabulated and printed the cæsium results as μμc./g potassium3. Calculations were based on previously determined calibration curves for the counter.
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The Journal of Agricultural Science (1967)