skip to main content

Title: ICP MS selection of radiopure materials for the GERDA experiment

The GERDA (GERmanium Detector Array) experiment, located in the Gran Sasso Underground Laboratory (LNGS, Italy) aims to search for neutrinoless double beta (0νββ) decay of the {sup 76}Ge isotope. Both an ultra-low radioactivity background environment and active techniques to abate the residual background are required to reach the background index (of 10{sup −3} counts/keV kg y) at the Q{sub ββ}. In order to veto and suppress those events that partially deposit energy in Ge detectors, the readout of liquid argon (LAr) scintillation light (SL) has been implemented for the second GERDA experimental Phase. A double veto system has been designed and constructed using highly radiopure materials (scintillating fibers, wavelength shifters, polymeric foils, reflective foils). This work describes the study of lead, thorium and uranium ultra-trace content, performed at the LNGS Chemistry Laboratory by High Resolution Mass Spectrometry (HR ICP MS), for the selection of all materials involved in the construction of the veto system.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [6] ;  [8]
  1. INFN, Laboratori Nazionali del Gran Sasso, via G.Acitelli 22, 67100 Assergi (Italy)
  2. (Italy)
  3. INFN, Laboratori Nazionali del Gran Sasso, via G.Acitelli 22, 67100 Assergi (AQ) (Italy)
  4. INFN Sezione di Milano Bicocca, Milano (Italy)
  5. TUM Munich (Germany)
  6. MPIK, Heidelberg (Germany)
  7. (Russian Federation)
  8. Physik-Institut, Universitat Zurich, 8057 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22488738
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1672; Journal Issue: 1; Conference: LRT 2015: 5. international workshop in low radioactivity techniques, Seattle, WA (United States), 18-20 Mar 2015; Other Information: (c) 2015 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; ARGON; DESIGN; FIBERS; FOILS; GE SEMICONDUCTOR DETECTORS; GERMANIUM 76; ICP MASS SPECTROSCOPY; KEV RANGE; LIQUID SCINTILLATION DETECTORS; RADIOACTIVITY; READOUT SYSTEMS; RESOLUTION; UNDERGROUND; URANIUM; VISIBLE RADIATION