od p35 fission products in a local or intermediate fallout situation. As instrumentation, techniques of calibration and the predicta- bility of the radionuclide spectrum from nuclear devices continue to improve, so will the usefulness of gamma-dose rate measurements for predicting the decline of gamma-dose rates. Practically speaking, the reliability of such measurements will depend upon the experience and judgement of the individuals making the measurements, the variety of environmental situations encountered and the time available for making such measurements. Their reliability is further substantiated by the fact that the levels of specific radionuclides in the various land organisms at different islands were roughly correlated with the gamma dose rates, Errors in predicted levels will tend to be conservative, i.e., higher than actual levels. RECOMMENDATIONS It would be useful in any future operations to have available known mixtures of xsadionuclides simulating the fallout radionuclides for a particular device, or better, a sample of the raw Jallout material collected at each site to be studied. This mixture could then be used to calibrate instruments, film badges and chemical dosimeters as time went on and as the specComparison of the decay of ry trum of gamma-energies changed.