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- W189578045 abstract "A system for continuous and simultaneous measurement of airborne radon concentration and working level (WL) has been developed. It has detection limits of about 0.05 pCi/L of radon and 5 x 10/sup -4/ WL for a one-hour integration period. The system, designated CRWM (Continuous Radon and Working Level Monitor), continuously samples air, flowing at less than 100 L/min, taken about 75 cm above the ground. The air is passed through a 47-mm membrane filter where the airborne particulates and ions are removed. A fraction (1 L/min) of this filtered air, is subsequently passed through a 2000-cm/sup 3/ aluminum scintillation cell in which radon concentration is determined by counting alpha scintillations. Working level is determined from polonium-218 and polonium-214 activities on the filter using a 490-mm/sup 2/ silicon diffused junction detector and a 1024-channel analyzer (alpha spectroscopy). Calibration procedures are discussed. Comparison of calibration factors measured over a relative-humidity range of 0 to 70% did not indicate a moisture dependence. Theoretical bases for measurement of radon and working level are developed. Diurnal variation of radon concentration is simulated using a sinusoidal function. A typical time variation of radon and working level measured in the vicinity of a mill is presented, andmore » measurement techniques are reviewed.« less" @default.
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- W189578045 date "1980-04-01" @default.
- W189578045 modified "2023-09-27" @default.
- W189578045 title "Systems for continuous measurement of airborne radon-222 concentration and working level" @default.
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