Public Radiation Exposure from Nuclear Power Generation in by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

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Extra resources for Public Radiation Exposure from Nuclear Power Generation in the United States (Ncrp Report : No. 92)

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3 Modeling Annual airborne contaminant releases were assessed for pathways considered relevant to particular types of sites. Exposures from airborne emissions were assessed for a hypothetical maximum individual residing about 1,600 m from the midpoint of the mine and for a population residing within an 80-km (50-mile) radius of the mine. Meteorological and geological parameters were selected to reflect conditions at the two model sites. 8. , 1981. NOTE: Water discharge rates are assumed to be 3 m3/min for the open pit mine and 2 m3/min for the underground mine.

It was assumed that the daughter products of 226Ra,including 210Pband 'loPo, were in secular equilibrium in the mine water discharged to the surface streams, but those with short half-lives, small branching ratios, or low dose conversion factors were excluded from the calculations. 7. These concentrations and flow rates were obtained from measurements of mine water discharged from underground (New Mexico) and surface (Wyoming) mines. They have no relation to ore production or to the average mine defined for the airborne assessment.

1979) reviewed measured transfer factors (soil-to-plant, forage-to-milk, and forage-to-meat) for 210Pband Rayno (1982) has reviewed the literature for these measured transfer factors for 238U/234U, 230Th,226Ra,210Pb,and 2 1 0 P ~ . 2 for nine conventional uranium mills. These estimates are based on generic parameters used in the source term models (NRC, 1980a) and on plant-specific operation data provided by the applicant for a license (NRC, 1982b). 0 pCi/m2-s) per radium-226 concentration a t 37 mBq/g (1 pCi/g) of tailings).

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