Low-level gas proportional counting in an underground laboratory

Loosli, H. H.; Heimann, Martin; Oeschger, Hans (1980). Low-level gas proportional counting in an underground laboratory. Radiocarbon, 22(2), pp. 461-469. Arizona Board of Regents, University of Arizona 10.1017/S0033822200009772

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Results of measurements in an underground laboratory, 70m of water equivalent below surface, are given. Background values of proportional gas counters with volumes between 16cc and 1.5L are lower by a factor of 2—4.5 compared to the values in the previously used laboratory (7m w.e.). High counting gas pressures, up to 5 at CH4 and up to 36 at P-10, enable the use of relatively small counters with correspondingly small background contributions from the walls. A separation of the residual background into different components is attempted, distinguishing a pressure dependent volume effect and surface correlated contributions. It can be shown that the selection of radioactively pure counter construction material is very important for a good low level counting system.

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