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Radon (thoron) daughter measurements with an automated, programmable, radiation monitor


, : Radon (thoron) daughter measurements with an automated, programmable, radiation monitor. Environmental Monitoring and Assessment 6(1): 59-70

A technical evaluation of an automated, programmable, grab-sampler manufactured by Pylon Electronic Development under the commercial name of WL-1000C has been conducted. Six different methods are implemented in the instrument for analyzing radiation data. Any one method can be used on command and easily selected by means of a keyboard. Available radiation data that can be retrieved on command include radon (thoron) daughter concentrations and radon (thoron) Working Levels. Measurements were carried out under laboratory-controlled conditions in a large (26 m3) radon/thoron test facility, designed for calibration purposes, and at an underground uranium mine. Data obtained with the WL-1000C have been compared with conventional grab-sampling (e.g., Kusnetz, Thomas-Tsivoglou and Markov methods) and with other automated radiation instrumentation previously tested at our laboratories. Tests were done under constant radiation conditions and also under rapidly fluctuating conditions in order to determine the response of the instruments and methods in these two cases of practical interest. The Working Level used in these experiments was in the approximate range of 0.01 to 10 WL. Tests were conducted under a variety of environmental conditions. Good agreement with grab-sampling data was found for radon daughters. Some discrepancies with grab-sampling data were found for radon daughter/thoron daughter mixtures. Disagreement in the latter case is to be expected because of .alpha.-energy overlap between RaA and ThC.

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Accession: 006255408

PMID: 24254544

DOI: 10.1007/BF00394288

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