Tadle 1 Pooled or Mean Urine Activity Concentration for 90, Year of Collection Urine Cone pci/2 Sr and L375 137, Urine Conc nci/2 Comment 1970 1.2 0.10 3640 ml - pooled 1970 1.3 0.13 3365 ml = pooled 1970 2.2 - 1100 ml - pooled 1970 1.9 - 930 ml = pooled 197] 0.96 0.22 3920 ml = pooled 1971 0.89 0.20 2960 ml - pooled 1971 1.2 0.21 3300 mi - pooled 1971 3.93 O.11 500 ml - pooled 1972 4.2 0.91 2700 mil - pooled 1973 6.7 1.3 mean of 14 people 1974 2.3 1.3 mean of 21 people 1975 7.3 1.8 pooled 1975 3.1 1.3 pooled 1976 5.3 2.2 mean of 25 people 1977 3.9 7.7 mean of 4 people 1978 6.1 1979 2.6 1979 2.8 1980 NA NA = Not Analyzed 14. 1.3 «87 NA mean of 35 people January, mean of 50 peopie May, mean of 40 people August