(1) Measure the magnitude of the biological contamination. (2) Determine the geographic distribution of the radioactive materials. (3) Determine the biological half lives of some of the radioactive materials. (4) Measure selective uptake and cycling of the contamination. (5) Provide another block of data for the better understanding of radiation contamination following a test with the kind of materials to be used and under the specific conditions of the test. Field operations’ (1) Collection of biological specimens should proceed as soon as possible after the detonation. (2) Sampling stations should be the same areas or similar to those sampled in the preliminary survey. (3) Operations in the field should be devoted primarily to gathering the specimens and field data; the processing of material, counting of the activity, and the evaluation of data can be