Abstract
Low background miniaturized proportional counters as developed for the G allex solar neutrino experiment can be applied to the detection of radioactive noble gas nuclides at very low activities. We have developed an apparatus that allows the activity of trace amounts of isotopes of the four noble gases Ar, Kr, Xe and Rn to be measured. The technique includes contamination-free chromatographic purification of raw gas samples and subsequent low-level counting. Minimum detectable activities of 100 μBq and below have been attained. The developed techniques can be used to determine the 222Rn and 85Kr concentration in nitrogen for the solar neutrino experiment B orexino. By applying efficient techniques to concentrate noble gases from nitrogen, minimum detectable activity concentrations below 1 μBq/m 3 of nitrogen (STP) have been reached for both nuclides.
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