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          Institute: MPI für Kernphysik     Collection: Neutrino Physics     Display Documents



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ID: 207260.0, MPI für Kernphysik / Neutrino Physics
Low-222Rn nitrogen gas generator for ultra-low background counting systems
Authors:Wojcik, Marcin; Zuzel, Grzegorz
Language:English
Research Context:Radon, Low background physics
Title of Journal:Nuclear Instruments and Methods in Physics Research Section A
Journal Abbrev.:NIM A
Review Status:not specified
Audience:Experts Only
Abstract / Description:A new stand-alone system for purification of boil-off nitrogen from 222Rn is described. The purification principle is based on the radon adsorption on charcoal at low temperatures (cryo-adsorption). The device can be attached to ordinary dewars, which are usually used for liquid nitrogen storage or transportation. The measured 222Rn
concentration in unpurified boil-off nitrogen is in the range of 0.5 mBq/m3, while the unit described can supply ultralow background detectors (e.g. gamma spectrometers or dark matter detectors) with gaseous nitrogen of 222Rn specific activity lower by a factor ~40. The lowest concentration achieved was 12+-3 microBq/m3. Using a 100-l dewar it is possible to produce effectively at least 40m3 of highly pure gas with the available rate between 0.3 and 2.5m3/h. The nitrogen flux can be set by adjusting the power to an electrical heater placed inside the dewar
Free Keywords:Radon, Low background detectors, nitrogen purification
External Publication Status:accepted
Document Type:Article
Affiliations:MPI für Kernphysik/Independent Research Group S. Schönert/Neutrino Physics
External Affiliations:Jagellonian University, Kraków
Identifiers:URL:http://www.sciencedirect.com/science?_ob=ArticleUR...
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