Abstract
Abstract The efficiency of the Karlsruhe etched track detector was determined over a wide range of radon exposures. Sixty four detectors were placed in an airtight chamber. The radon concentration was kept at about 80 kBq.m-3 by circulating air over a solid radium source. At predetermined times, a group of four detectors was taken out of the chamber. The exposure period varied from a few hours up to several months in order to determine the efficiency curve for low exposure as well as for the region of saturation. The functional form y=a(1-e-bx) was fitted to the data. The low exposure range was fitted with only first six data points. The slope is 0.546 tracks.cm-2.kBq-1.m3.h-1, which is comparable to the earlier value of 0.55 tracks.cm-2.kBq-1.m3.h-1. The high exposure range was fitted with the whole data set. The two curves intersect at 2700 tracks.cm-2. At higher track densities the curve based on the whole data set has to be used to convert the number of tracks into an exposure.
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