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Airborne measurements were obtained for both natural and man-made gamma radiation over Steed Pond and surrounding areas. The first survey (June 1984) was conducted when the pond was filled to normal capacity for the time of the year. On September 1, 1984, the Steed Pond dam spillway failed causing the pond to drain. The four subsequent surveys were conducted with the pond drained. The second survey (mid-September 1984) and the third (August 1985) were conducted to study silt deposits exposed by the drop in water level after the spillway's opening. Steed Pond data from the February 1987 and April 1989 Savannah River Site surveys have been included to bring this study up to date.
An in situ gamma ray spectrometer system was operated at Enewetak Atoll from July 1977 to December 1979 in Support of the Enewetak.Cleanup Project.-The system employed a high purity germaniuq?planar detector suspended at a height of 7.4 m above ground: Conversion factors were established t&::telate measured photopeak count rate data to source concentration in the soil. Data obtained for *41Am, together with plutonium-to-americium ratios obtained from soil sample analyses, were used to establish areaaveraged surface (0-3 cm)'tran'suranic concentration vaiues'. ln areas wljich excee,ded. .. .. cleanup criteria, measurements were made in an iterative fashion to guide so/l.removal uritil levels we're reduced below'the cleanup criteria. Final measurements~made~aftersbi! removal had been completed were used to document remaining surface transuranic'concentratio'n values and to establish external exposure rate levels due to 137Cs and 60C0..
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