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Pohl Egon; Pohl-Ruling, Johanna
Health Physics: October 1976
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For air-sampling 30-l. containers of flexible foil are taken to the sites. To measure the 222Rn and 226Ra content of water, special bottles are used with volumes of 0.5 and 2.51. respectively. All samples are measured in the laboratory. In this way it is possible to take a great number of samples at the sites considered, which is necessary to obtain significant annual mean values. The measuring equipment consists of a 10–20 l. ionization chamber in connection with an electronic electrometer and a chart-recorder. The air sample is transferred very fast into the evacuated chamber, so that one can define the zero-point for the increase in ionization current due to the short-lived decay products. The radon content of a water sample is also transferred as fast as possible into the chamber with inactive air streaming through a de-emanating bottle. Changeable central electrodes keep the background low and permit a rapid succession of measurements. For the determination of small 226Ra contents a double-chamber equipment with background compensation is used.

©1976Health Physics Society