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Radon purification facility, effect inside NEMO3

Radon purification facility, effect inside NEMO3. Radon purification facility. Running since Oct. 4th, 2004 in FréjusUnderground Lab. 1 ton charcoal @ -50 o C, 7 bars Flux: 150 m 3 /h Activity of 222 Rn : Before Facility = 15 Bq/m 3 After Facility < 15 mBq/m 3.

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Radon purification facility, effect inside NEMO3

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  1. Radon purification facility, effect inside NEMO3

  2. Radon purification facility Running since Oct. 4th, 2004 in FréjusUnderground Lab. 1 ton charcoal @ -50oC, 7 bars Flux: 150 m3/h Activity of 222Rn : Before Facility = 15 Bq/m3 After Facility < 15 mBq/m3

  3. Now : A(222Rn) in the LSM ~10 Bq/m3 Fall 2003 : A(222Rn) ~5 Bq/m3 Mid 2004 : A(222Rn) ~0.2 Bq/m3 Anti-radon tent for NEMO3 detector S E W N

  4. (all operations involving crystals and PMTs -including photos- in HP N2 atmosphere) detectors during installation; in the central and right up detectors the new shaped Cu shield surrounding light guides (acting also as optical windows) and PMTs was not yet applied installing DAMA/LIBRA detectors assembling a DAMA/ LIBRA detector filling the inner Cu box with further shield view at end of detectors’ installation in the Cu box closing the Cu box housing the detectors

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