fi 4 +i PESEEREED beta scintillation counters with t batisrounds of 0.3 to Oo2 counts per (5) minute have also been in us2,'~/ 205 Reproducibility In Table 2, duplicates strontium-90 analyses for some soil samples collected in the United States in 1956 are tabulated, to the satisfactory reproducibility of the method. These data attest Im all cases, the analytical precision is within two standard deviations of the error due to countings (5) LeVine, Ho Ds, Charlton, L., Graveson, Ro Te, Low Background Nuclear Counting Equipment, HASL-60, Merch 23, 1959.