Table 3. Summary Information on the Twelve Calves Used (in Phase ITI) to Investigate the Relative Biological Availability of Iv Vivo and In Vitro Plutonium-238 Labeled Milk Calves Receiving In Vivo Plutonium-238 Labeled Milk Pre-Study Weight (kg) Sex Pre-Study Age (days) Sacrifice Age (days) Sacrifice Weight (kg) 92* 38.6 Male 7 16 30.9 96 35.9 Male 7 16 32.7 7278 27.7 Female 7 16 30.0 101 34.1 Male 8 17 34.1 7284 30.9 Female 7 16 30.0 93%** 35.0 Male 7 16 31.8 Pre-Study Age (days) Sacrifice Age (days) Sacrifice Weight (kg) 13 31.4 Calf Number Calves Receiving In Vitro Plutonium-238 Labeled Milk Calf Number Pre-Study Weight (kg) Sex 7359 33.8 Female 4 170 41.3 Male 4 7 349% 35.8 Female 6 15 33.2 163 42.3 Male 5 14 40.0 NT 29.3 Female 7 16 28.2 171%* 42.8 Male 4 13. 40.0 *Control animal maintained with experimental calves *kControl animal maintained in outside pen *x*kAge at time of death, no tissue samples collected 184 Gx** -