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Field radiometer-radiometer "DP-5" (PRR-1) was produced presumably since 1963. Designed to detect and quantify the beta contamination of the surface of various objects, as well as to detect and measure levels of gamma radiation. The device has seven measurement subranges: 1st subrange from 5 to 200 R / h. 2nd from 0.5 to 5 R / h. 3rd from 0.05 to 0.5 R / h. 4th from 100,000 to 1,000,000 rasp / min. cm2. 5th from 10,000 to 100,000 rapm. cm2. 6th from 1000 to 10,000 rasp / min. cm2. 7th from 100 to 1000 rasp / min. cm2. On the Internet, the device is described in detail. Photos of the device from the site: http://forum.rhbz.org/