https://doi.org/10.1140/epjc/s10052-022-10859-z
Regular Article - Experimental Physics
Long term measurement of the 
Rn concentration in the Canfranc Underground Laboratory
1
Centro de Astropartículas y Física de Altas Energías (CAPA), Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
2
Laboratorio Subterráneo de Canfranc, Paseo de los Ayerbe s/n, 22880, Canfranc Estación, Huesca, Spain
3
AEMET, Delegación Territorial de AEMET en Aragón, Paseo del Canal 17, 50007, Zaragoza, Spain
4
Fundación ARAID, Avenida de Ranillas 1D, 50018, Zaragoza, Spain
5
Laboratorio de Bajas Actividades (LABAC), Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
6
EUPLA, Calle Mayor 5, 50100, Zaragoza, La Almunia de Doña Godina, Spain
Received:
30
March
2022
Accepted:
27
September
2022
Published online:
8
October
2022
We report the results of 6 years (2013–2018) of measurements of 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 Rn concentration and the relative humidity. Both correlated variables show a seasonal periodicity. The joint analysis of laboratory data and 4 years (2015–2018) of the meteorological variables outside the laboratory shows the correlation between the 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, we have monitored (2019–2021) for 2 years of live time, the radon-free air provided by the radon abatement system installed in the laboratory.
© The Author(s) 2022
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