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Low-222Rn nitrogen gas generator for ultra-low background counting systems

MPG-Autoren
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Zuzel,  Grzegorz
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Wojcik, M., & Zuzel, G. (n.d.). Low-222Rn nitrogen gas generator for ultra-low background counting systems. Nuclear Instruments and Methods in Physics Research Section A. Retrieved from http://www.sciencedirect.com/science?_ob=ArticleURL&_aset=B-WA-A-W-V-MsSAYZA-UUA-AAUDVVEVVA-AAUCUBUWVA-YBDUVWCED-V-U&_rdoc=1&_fmt=summary&_udi=B6TJM-4DWVP33-2&_coverDate=12%2F23%2F2004&_cdi=5314&_orig=search&_st=13&_sort=d&view=c&_acct=C000002578&_version=1&_urlVersion=0&_userid=41881&md5=591d41ef64ecaa0bbbf1efca2111f0c2.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-8636-7
Zusammenfassung
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