Low Background Aspects of GERDA
The GERDA experiment operates bare Germanium diodes enriched in 76Ge in an environment of pure liquid argon to search for neutrinoless double beta decay. A very low radioactive background is essential for the success of the experiment. We present here the research done in order to remove radio-impurities coming from the liquid argon, the stainless steel cryostat and the front-end electronics. We found that liquid argon can be purified efficiently from 222Rn. The main source of 222Rn in GERDA is the cryostat which emanates about 55 mBq. A thin copper shroud in the center of the cryostat was implemented to prevent radon from approaching the diodes. Gamma ray screening of radio-pure components for front-end electronics resulted in the development of a pre-amplifier with a total activity of less than 1 mBq 228Th.
SIMGEN Hardy;
HULT Mikael;
GONZALEZ DE ORDUNA R.;
2012-03-01
American Institute of Physics
JRC62485
http://dx.doi.org/10.1063/1.3579573,
https://publications.jrc.ec.europa.eu/repository/handle/JRC62485,
10.1063/1.3579573,
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