U.S. National Council on Radiation Protection and Measurements

Guidance for the collection of bioassay samples has been summarized by the U.S. National Council on Radiation Protection and Measurements (NCRP) [30]. In most occupational exposure situations, any uranium actually absorbed in the body is rapidly excreted in urine. Therefore, bioassay analyses used to estimate the occupational exposure must be collected as soon as possible and for some time after discovery and control of the exposure conditions. 

NCRP U.S. National Council on Radiation Protection and Measurements, Bethesda (MD),... 

The models introduced by Findeisen (117), Altshuler (118), and Taulbee and Yu (119) are considered primary deposition models, in that each proposed original and independent mathematical formalisms to describe particle transport onto airway surfaces. Incidenfly, they are also based on different models of the geometric structure of the human lung. Later, the formalisms of the primary models were adopted and modifled by many authors, resulting in so-called secondary deposition models (120-134). Recent models have been proposed by the U.S. National Council on Radiation Protection and Measurements (NCRP 136-137) and by the Task Group on Human Respiratory Tract Models for Radiological Protection (ICRP 137,138). 

Calculation of lung cancer risk for radon daughter exposure is based on factors developed by the National Council on Radiation Protection and Measurements (NCRP, 1984). The risk coefficients are expressed in terms of lifetime risk from lifetime exposure for a population of mixed ages, comparable to the standardized U.S. population, and range between one and two per 10,000 WLM of exposure. The percent increase in risk is related to a normal lifetime lung cancer risk of 0.041. 

NCRP (1987c). National Council on Radiation Protection and Measurements. Radiation Exposure of the U.S. Population from Consumer Products and Miscellaneous Sources, NCRP Report No. 95 (National Council on Radiation Protection and Measurements, Bethesda, Maryland). 

SOURCES lE-4 risk level contaminant concentrations were obtained from U.S. EPA generic site data using RESRAD (draft). Actual site data will vary depending on individual site parameters. Radionuclide concentrations may vary depending on the risk model used. lE-5 and lE-6 risk level data were derived from the draft EPA lE-4 risk level concentrations. Typical U.S. background data were principally from the National Council on Radiation Protection and Measurement Report Number 94. 

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