FIELD: measurement technology. SUBSTANCE: sensitive element of the radiometer is manufactured in the form of assembly of thin crystal Csl(Tl)-grid-crystal Nal(Tl), lid of case is mobile and there exists intercoupling between elements of radiometer that provides for optimum conditions while measuring volumetric activities of radon, thoron and daughter products of their decay. EFFECT: measurement of volumetric activities of radon, thoron and daughter products of their decay with use of one radiometer, diminished time of measurement of daughter products of decay of radon and thoron, improved operational characteristics and reduced energy consumption when measuring radon.
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