By National Council on Radiation Protection and Measurements

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Extra resources for Evaluation of occupational and environmental exposures to radon and radon daughters in the United States : recommendations of the National Council on Radiation Protection and Measurements

Sample text

5. 75 L/min, 1250 cm3 per breath, 4 second breathing cycle (318, 118, 318, 118) inspiration, pause, expiration, pause. Resting rate 9 L/min, 750 cm3per breath, 5 second cycle. 6. Mucus clearance times taken from. 7. Twenty percent alveolar deposition eubtracted before calculation of deposition during expiration. 8. The alpha dose is that to shallow basal cells 22 pm below the surface of the bronchial epithelium. From generation 10 to 16 where epithelial thickness is thin the values in parentheses are the alpha dose a t 10 pm below the surface of the bronchial epithelium.

Evans wark appears in Jackson (1940) unpublished. 'Spiers, 1956 JCAE, 1967 fpot = the total potential a l p k energy of the unattached daughters. 12 for the lung. F 3 8 Z ? E! > u z:m \ W w 34 / 4. 3-liter lung air volume and taking into account the small additional absorption of radon in the lung tissue. 5 L, a recalculated upper limit based upon whole lung dose from exposure to radon gas alone is about 4000 pCi/L. ICRP (1981) derive a limit of 4000 pCi/L using Q = 20. Thus, values range from about 3000 pCi/L to 5000 pCi/L.

Their minimal depth is on the order of 35 pm beneath the surface of the mucus (FRC, 1967) or -22 pm below the epithelial surface. Fortuitously, there is little numerical difference in calculated dose between a model that uniformly loads the mucus and serous layers (combined thickness is assumed to be 15 pm) with activity, and calculates the dose at a depth of 22 I m below the epithelial surface which places all of the activity on the surface of the mucus and calculate dose a t 35 pm below this surface.

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