Journal
APPLIED RADIATION AND ISOTOPES
Volume 61, Issue 2-3, Pages 197-201Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2004.03.045
Keywords
BOREXINO experiment; argon and krypton in nitrogen; mass spectrometry
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Among other radionuclides, Ar-39 and Kr-85 are potential background sources in the solar neutrino detector BOREXINO. The expected low event rate requires that the nitrogen used in the experiment needs to have lower concentrations than 0.5 muBq/m(3) for Ar-39 and 0.2 muBq/m(3) for Kr-85, corresponding to volume concentrations in N-2 of 0.4 x 10(-6) m(3)/m(3) for Ar and 0.2 x 10(-12) m(3)/m(3) for Kr. Applying gas mass spectrometry and special care in the sampling technique we succeeded in finding the required purity. In addition, we studied the possibility to purify nitrogen from Kr by the adsorption method. (C) 2004 Elsevier Ltd. All rights reserved.
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