In experiments looking for rare events, like neutrinoless double beta decay (DBD0v) and dark matter search (DM), one of the main issue is to increase the experimental sensitivity through the material selection and production. In the specific minimizing the background contribution coming from the materials used for the detector realization. Moreover the net reduction of the background produced by the bulk part of the apparatus has raised concerns about the background contribution coming from the surfaces. Many procedures and techniques were developed during the last years in order to remove and to minimize the presence of possible contaminants on detector surfaces. To succeed in this strategy a big effort was put in defining: all possible mechanisms that lead to surface contaminations, specific cleaning procedures which are able to reduce and control the surface radioactivity. The presence in air and gases of possible radioactive elements that can stick on the detector surfaces can lead to a recontamination process that will vanish all the applied cleaning procedures. It will be presented and analyzed the contribution that an exposure of detector components to 222Rn, a radioactive isotope produced by the 238U chain, rich environment will have on the background of rare events experiments like CUORE (DBD0v) and EDELWEISS (DM).
(2011). Radon-induced surface contaminations in neutrinoless double beta decay and dark matter experiments. (Tesi di dottorato, Università degli Studi di Milano-Bicocca, 2011).
Radon-induced surface contaminations in neutrinoless double beta decay and dark matter experiments
PATTAVINA, LUCA MARIA
2011
Abstract
In experiments looking for rare events, like neutrinoless double beta decay (DBD0v) and dark matter search (DM), one of the main issue is to increase the experimental sensitivity through the material selection and production. In the specific minimizing the background contribution coming from the materials used for the detector realization. Moreover the net reduction of the background produced by the bulk part of the apparatus has raised concerns about the background contribution coming from the surfaces. Many procedures and techniques were developed during the last years in order to remove and to minimize the presence of possible contaminants on detector surfaces. To succeed in this strategy a big effort was put in defining: all possible mechanisms that lead to surface contaminations, specific cleaning procedures which are able to reduce and control the surface radioactivity. The presence in air and gases of possible radioactive elements that can stick on the detector surfaces can lead to a recontamination process that will vanish all the applied cleaning procedures. It will be presented and analyzed the contribution that an exposure of detector components to 222Rn, a radioactive isotope produced by the 238U chain, rich environment will have on the background of rare events experiments like CUORE (DBD0v) and EDELWEISS (DM).File | Dimensione | Formato | |
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