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Radiation Protection Dosimetry 55:273-277 (1994)
© 1994 Oxford University Press

Background of Passive Radon Monitors

K. Fujimoto

The systematic bias in measurements by passive radon monitors is an important source of error in measurements at low concentrations as usually encountered in surveys. Such a bias cannot be detected by calibration or intercomparison since these are commonly performed for high concentrations. The precise evaluation of the background of monitors is necessary for the estimation of bias. The background of radon monitors with track detectors is often estimated from detector films which are not mounted in monitor containers. That estimation shows a part of the background. The actual background of monitors can be obtained from the measurement of films installed in monitor containers and kept in a radon free environment. During storage the films will register signals from natural radionuclides contained in the monitor. The signal, i.e. the bias of our radon monitor, was estimated to be 26 etch pits per cm2 which corresponds to a radon concentration of 6.2 Bq.m-3.


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