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TG 11 overview - Material screening -

TG 11 overview - Material screening -. Hardy Simgen MPI für Kernphysik Heidelberg. Outline. Gamma-ray screening Radon: Online monitoring Behaviour of Rn and Rn daughters Emanation measurements Hardware: New gas counting system at LNGS New Germanium spectrometer for MPIK.

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TG 11 overview - Material screening -

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  1. TG 11 overview- Material screening - Hardy Simgen MPI für Kernphysik Heidelberg

  2. Outline • Gamma-ray screening • Radon: • Online monitoring • Behaviour of Rn and Rn daughters • Emanation measurements • Hardware: • New gas counting system at LNGS • New Germanium spectrometer for MPIK

  3. Gamma-ray screening resultsActivities in [mBq/kg]

  4. Gamma-ray screening Screening of PCB for PZ0  Matthias Laubenstein‘s talk

  5. Behaviour of radon + radon daughters • Work is proceeding in Cracow • No update this time, but: „We are getting a clearer picture of Rn + Rn daughters in LN2, but it is not yet complete“ (Marcin Wojcik). • Further activity in preparation: Behaviour of Rn daughters on Ge discs

  6. Radon monitor Ready for shipping  Jochen Schreiner‘s talk

  7. 222Rn emanation measurements Focus on cryostat and lock  Grzegorz Zuzel‘s talk

  8. GNO shield for proportional counters

  9. Ability to measure gaseous radioactive isotopes at Gran Sasso (222Rn, 85Kr, 37Ar, 39Ar, 133Xe, 71Ge, ... ). • On-site 222Rn emanation measurements are now possible for small samples.

  10. sample Airlock like GeMPI 2 and 3 sample 250 Plasticscintillator 2 plates 30 mm each 50 mm Cu Plasticsc 50 mm 50 mm and more Pb 50 mm PE + BC4 ≈ 1250 mm Airtight glovebox system ≈ 2015 mm steel plate Cu-frame for block (existing) steel frame 529x529x750? ≈ 1300 PMT 1“x1“ damping-plate Item- profil

  11. sample sample sample View from top sample-chamber open Airtight glovebox system middle veto counter slided aside shielding-block lifted up and slides aside sample container are moved along rails Ge airlock

  12. 1 From: A focused review of operations and thorium exposures at the Dow Chemical Company Madison Plant, Advisory Board on Radiation and Worker Health (S. Cohen and Associates,2007) 0.8 Th activity 228 Th activity 228 Th 0.6 228 Ra activity 228 Ra 232 0.4 Relative to 0.2 0 G. H. GERDA collab. Meeting, Padova 11. -13. March 09 0 5 10 15 20 25 30 228 Time after complete Ra removal [y] Disequilibrium in the Th decay chain rel. activity after Ra removal time since Ra removal [y] rel. activity after Ra removal time since Ra removal [y]

  13. G. H. GERDA collab. Meeting, Padova 11. -13. March 09 exposure age via 54Mn rel. activity after Ra removal G5 G7 ∞ time since Ra removal [y]

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