For the above reasons, the alpha detectors were used for radiological control monitoring of personnel and equipment (in the dry state) and not for routine terrestrial survey measurements. Interpretation of measurements made by beta-gamma detectors has always been questionable due to the nature of the radiation and the complex interaction with the detectors. The beta-gamma survey instruments utilized for the survey were G-M detectors, with appropriate shielding. The high range instrument, the E-500B, was used to evaluate scrap metal which was indicating gamma levels too high for the Baird-Atomic Scintillator. No real effort was made to determine, by shielding, the exact fraction of beta emissions. It was recognized that such contaminated scrap would be removed during the cleanup and only identification that it was radioactive was necessary. The thin window beta-gamma detector, "Pancake" probe, was used, on specific occasions, to evaluate contaminated scrap according to current AEC directives which require surveying with a 7 mg/cm> window. It is impossible in the field to obtain anything but gross estimates of activity with portable beta-gamma instruments. The limitations on energy dependence, inability to discriminate between low energy gamma radiation and beta emissions, and the rather severe geometry dependence were recognized, tne the instruments used accordingly, only as indicators. No attempt was made to determine activity per unit area or other estimate of relative concentration with these instruments. The gamma-only detectors used in the field measurements effort also had their limitations. 1375, The Baird-Atomic Scintillator was calibrated with The Nal scintillator crystal youla respond differently to 656 and other radionuclide emissions, depending on the effective energy of the gamma