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Measurements of natural radioactivity in European underground labs within the ILIAS project

Measurements of natural radioactivity in European underground labs within the ILIAS project. Jan Kisiel Institute of Physics, University of Silesia, Katowice, Poland (kisielj@us.edu.pl). ILIAS (http://ilias.in2p3.fr/ilias_site/ilias.htm).

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Measurements of natural radioactivity in European underground labs within the ILIAS project

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  1. Measurements of natural radioactivity in European underground labs within the ILIAS project Jan Kisiel Institute of Physics, University of Silesia, Katowice, Poland (kisielj@us.edu.pl) Warszawa, July 3rd 2006

  2. ILIAS (http://ilias.in2p3.fr/ilias_site/ilias.htm) • „is an Integrated Infrastructure Initiative that has pulled together all of Europe’s leading infrastructures in Astroparticle Physics” • „results from a consultation of the community and an internal reviwe process throught ApPEC” • 20 participants + many non contactor institutions • Three scientific poles: - Physics in deep Underground laboratories (Gran Sasso, Modane, Canfranc and Boulby) 1 Transnational access activity 3 Networking activities (Deep Underground Science Laboratories, Direct dark matter detection, Search on double beta decay) 2 Joint research activities (Low Background Techniques for Deep Underground Science, Integrated double-beta-decay European Activities) - Gravitational wave detection - Theoretical astroparticle physics Warszawa, July 3rd 2006

  3. What have been done? • Gran Sasso Lab. (December 2004): in-situ measurements, radon emission from the surface, water samples measurements, • Boulby Lab. (August 2005): in-situ measurements, radon emission from the surface, rock samples measurements, • Sieroszowice/Poland, salt chamber: in-situ measurements, radon emission from the surface, rock samples measurements. Warszawa, July 3rd 2006

  4. 6-17.12. 2004 r. Warszawa, July 3rd 2006

  5. LNGS measurements, Dec’2004 – cont. 222Rn concentration in the water Liquid scintilator method (measured with Wallac 1414 WinSpectral liquid sintillation Counter, in Katowice), 12 measurements – see map) Samples 1-10, 2-9, … were taken in the same place with slightly different methods (radan mobility!) – results are consistent Warszawa, July 3rd 2006

  6. LNGS, Dec’2004: map of water samples measurements Warszawa, July 3rd 2006

  7. LNGS measurements, Dec’2004 – cont. 222Rn concentration in the air Pico-Rad method (Insta-Fluor scinitilator, activate carbon, 48h exposure, 12 mesurements in Halls A, B and C) Warszawa, July 3rd 2006

  8. In situ measurements: • HPGe detector (EG&G ORTEC): - 30% relative efficiency, - crystal length 59mm and diameter 58.6mm, - resolution: 0.67keV at 122keV and 1.73keV at 1.33MeV • M-1 B32 (ORTEC) software for the determination of radioisotope activity • M-1 geometry: detector mounted 1m above the surface, gamma emitters recorded from the area in a radius of 10m to a depth of about 30cm (depending on ground and photon enregy) Warszawa, July 3rd 2006

  9. Sieroszowice: KGHM copper mine with large (15x15x100m) salt coverns at about 1000m underground – possible location of an underground low background laboratory in Poland Warszawa, July 3rd 2006

  10. Warszawa, July 3rd 2006

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  13. Net Count Rate [cps] – in situ mesurements Warszawa, July 3rd 2006

  14. In situ measurements: GS, Boulby, Sieroszowice Integral background counting rates Warszawa, July 3rd 2006

  15. In situ measurements: GS, Boubly and Sieroszowice Warszawa, July 3rd 2006

  16. Radon 222Rn measurements in Boulby: • Durridge RAD7 detector has been used in its sniff mode: - looks at the 6MeV alpha particles from the 218Po decay, - variations of radon emission has been monitored by using 48-hours protocol, 1 hour intervals, - checks of „internal humidity” (detector works correctly if internal humidity < 10%) - mesurements in 4 points: 3 in JIF area + 1 in H area. Warszawa, July 3rd 2006

  17. Radon measurements: Boulby 2005 Warszawa, July 3rd 2006

  18. Radon measurements in Boulby: results • Mean (from 48 hours measurement) values: - H area: 2.3±1.7Bq/m3 - JIF area 1 (Box2): 2.5±1.4Bq/m3 - JIF area 2 (transport hall): 4.2±1.9Bq/m3 - JIF area 3 (main lab): 2.5±1.9Bq/m3 • Conclusions: - mean values are „practically” the same Warszawa, July 3rd 2006

  19. Future plans (2006): • 2 in-situ measurements in 2006 (Modane, Boulby and Canfranc): - use two (not one!) portable detectors, - HPGe detector (EG&G ORTEC) the „old” one, - GX3020 (Canberra Industries): possibility of measurements in different geometries!, with the minimum detectable activity about 0.1Bq/kg, - radon emission measurements, - rock and/or water samples measurements Warszawa, July 3rd 2006

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