Long term measurement of the ${}^{222}$Rn concentration in the Canfranc Underground Laboratory

Abstract

We report the results of six years (2013-2018) of measurements of ${}^{222}$Rn air concentration, relative humidity, atmospheric pressure and temperature in the halls A, B and C of the Canfranc Underground Laboratory (LSC). We have calculated all the Pearson correlation coefficients among these parameters and we have found a positive correlation between the ${}^{222}$Rn concentration and the relative humidity. Both correlated variables show a seasonal periodicity. The joint analysis of laboratory data and four years (2015-2018) of the meteorological variables outside the laboratory shows the correlation between the ${}^{222}$Rn concentration and the outside temperature. The collected information stresses the relevance of designing good Rn-mitigation strategies in current and future experiments at LSC; in particular, we have checked for two years (2017-2018) the good performance of the mitigation procedure of the ANAIS--112 experiment. Finally, in another measurement (2019-2021) for two years of live time, we report an upper limit to the residual ${}^{222}$Rn content of the radon-free air provided by the radon abatement system installed in the laboratory.

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Cited by in corpus (1)

• Improving ANAIS-112 sensitivity to DAMA/LIBRA signal with machine learning techniques