1. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 1 Coordinated gamma measurements in the underground labs Jan Kisiel Institute of Physics, University of Silesia, Katowice, Poland (kisielj@us.edu.pl)

2. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 2 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.

3. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 3 6-17.12. 2004 r.

4. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 4 Sample 1102938 Bq/dm 3 6.1 ± 0.46.5 ± 0.49.3 ± 0.59.4 ± 0.54.4 ± 0.34.3 ± 0.3 Sample 47561112 Bq/dm 3 11.4 ± 0.610.2 ± 0.55.8 ± 0.46.0 ± 0.55.0 ± 0.45.4 ± 0.4 Samples 1-10, 2-9, … were taken in the same place with slightly different methods (radan mobility!) – results are consistent LNGS measurements, Dec’2004 – cont. 222 Rn concentration in the water Liquid scintilator method (measured with Wallac 1414 WinSpectral liquid sintillation Counter, in Katowice), 12 measurements – see map)

5. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 5 LNGS, Dec’2004: map of water samples measurements

6. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 6 222 Rn concentration in the air HALL B point123456 Bq/m 3 170.4 ± 5.0174.0 ± 5.0189.6 ± 5.2193.2 ± 5.3297.6 ± 7.7194.4 ± 5.3 HALL AHALL C point789101112 Bq/m 3 189.6 ± 5.2187.2 ± 5.2160.8 ± 4.8249.6 ± 7.0246.0 ± 6.9324.0 ± 8.1 LNGS measurements, Dec’2004 – cont. Pico-Rad method (Insta-Fluor scinitilator, activate carbon, 48h exposure, 12 mesurements in Halls A, B and C)

7. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 7 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 enrgy)

8. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 8 Sieroszowice: KGHM copper mine with large (15x15x100m) salt coverns at about 1000m underground – possible location of an underground low background laboratory in Poland

9. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 9

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11. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 11

12. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 12 Net Count Rate [cps] – in situ mesurements Peak Bi214-609 keV (Ra226) Ac228-911 keV (Th232) K40 - 1460 keV Gran Sasso 0.487 ± 0.0020.048 ± 0.0030.268 ± 0.002 Boulby 0.068 ± 0.0020.016 ± 0.0010.262 ± 0.002 Sieroszowice 0.038 ± 0.0030.006 ± 0.0010.020 ± 0.003

13. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 13 Energy [keV]Gran SassoBoulbySieroszowice 50-270057.68 (0.05)17.00 (0.01)2.30 (0.02) In situ measurements: GS, Boulby, Sieroszowice Integral background counting rates

14. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 14 226 Ra Bq/kg 214 Pb Bq/kg ( 226 Ra) 214 Bi Bq/kg ( 226 Ra) 212 Pb Bq/kg ( 232 Th) 228 Ac Bq/kg ( 232 Th) 40 K Bq/kg Gran Sasso 35 ± 332 ± 129 ± 17.9 ± 0.27.2 ± 0.594 ± 1 Boulby < 85.3 ± 1.84.5 ± 1.22.1 ± 0.22.6 ± 0.889.8 ± 1.3 Sieroszowice < 84.2 ± 2.32.5 ± 0.90.8 ± 0.40.7 ± 0.39.2 ± 1.7 In situ measurements: GS, Boubly and Sieroszowice

15. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 15 Radon 222 Rn measurements in Boulby: Durridge RAD7 detector has been used in its sniff mode: - looks at the 6MeV alpha particles from the 218 Po 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.

16. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 16 Radon measurements: Boulby 2005

17. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 17 Radon measurements in Boulby: results Mean (from 48 hours measurement) values: - H area: 2.3±1.7Bq/m 3 - JIF area 1 (Box2): 2.5±1.4Bq/m 3 - JIF area 2 (transport hall): 4.2±1.9Bq/m 3 - JIF area 3 (main lab): 2.5±1.9Bq/m 3 Conclusions: - mean values are „practically” the same

18. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 18 Future plans (2006): 2 in-situ measurements in 2006 (Modane and Boulby): - 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

19. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 19 226 Ra 214 Pb 214 Bi 212 Pb 228 Ac 40 K Bq/kg Boulby Hala B 35 ± 332 ± 129 ± 17.9 ± 0.27.2 ± 0.594 ± 1 Sieroszowice < 84.2 ± 2.32.5 ± 0.90.8 ± 0.40.7 ± 0.39.2 ± 1.7 Wyniki z pomiarów in situ

20. ILIAS J1, 3rd General Meeting, Paris, 14th Feb 2006 20 Energia [keV] Gran S. h. cz. I Gran S. h. cz. II Siero- szowice Boulby 40-270049.8052.202.020.0 40-63043.2745.221.690.0 630-7000.670.680.030.0 700-27005.856.100.300.0 Integral background counting rates