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Title: Radon induced surface contaminations in low background experiments

In neutrinoless double-beta decay and dark matter searches, one of the main issues is to increase the experimental sensitivity through careful material selection and production, minimizing the background contributions. In order to achieve the required, extremely low, counting rates, very stringent requirements must be fulfilled in terms of bulk material radiopurity. As the experimental sensitivity increases, the bulk impurities in the detector components decrease, and surface contaminations start to play an increasingly significant role In fully active detectors, like cryogenic particle detectors, surface contaminations are a critical issue (as shown by the CUORICINO experiment). {sup 222}Rn is by far the most intense source of airborne radioactivity, and if a radio-pure material is exposed to environment where the Radon concentration is not minimized, {sup 210}Pb and {sup 210}Po contaminations can occur. The mechanisms and the dynamics of Radon-induced surface contaminations are reviewed, and specific solutions to prevent and to reject the induced background are presented.
Authors:
 [1]
  1. INFN - Laboratori Nazionali del Gran Sasso, I-67010 Assergi (AQ) (Italy)
Publication Date:
OSTI Identifier:
22218204
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1549; Journal Issue: 1; Conference: LRT 2013: 4. international workshop on low radioactivity techniques, Assergi (Italy), 10-12 Apr 2013; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CONCENTRATION RATIO; COUNTING RATES; CRYOGENICS; DOUBLE BETA DECAY; IMPURITIES; LEAD 210; MULTIPARTICLE SPECTROMETERS; NONLUMINOUS MATTER; PARTICLE IDENTIFICATION; POLONIUM 210; RADIATION DETECTORS; RADIOACTIVITY; RADON 222; SENSITIVITY; SURFACE CONTAMINATION