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Radon Purification Facility at NEMO3: Efficient Purification of Radon Gas

Learn about NEMO3's radon purification facility running since 2004 in Fréjus Underground Lab, achieving great reduction in radon activity levels to ensure accurate detection. Explore the process and impact of radon purification on NEMO3 detectors.

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Radon Purification Facility at NEMO3: Efficient Purification of Radon Gas

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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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