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A method for testing and calibrating tissue equivalent proportional counters with 37Ar is described. 37Ar is produced by exposure of argon in its normal isotope composition to thermal neutrons. It is shown that--up to volume ratios of 0.01 of argon to the tissue equivalent gas--there is no appreciable effect of the argon admixture on the function of the proportional counter. Conventional calibration methods with characteristic x-rays or with alpha-particles require modifications of the detectors, and they test only small sub-volumes in the counters. In contrast, argon permits calibrations and tests of the resolution that are representative for the entire counter volume and that do not require changes in detector construction. The method is equally applicable to multi-element proportional counters; it is here exemplified by its application to a long cylindrical counter of simplified design that is part of such a multi-element configuration.
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H Roos
December 1970,
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Radiation research,
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Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine,
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Physics in medicine and biology,
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E Anachkova, and
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August 1982,
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E Anachkova, and
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January 1963,
Arhiv za higijenu rada i toksikologiju,
