Sokolov: Supervision, Software, Conceptualization. Pohuliai: Writing - original draft, Writing - review & editing. If it is decided to organize a low-background facility in CRediT authorship contribution statement Purging the measuring chamber of the gamma spectrometer with nitrogen gas at a rate of 0.15 L/h allowed us to further improve this parameter to 0.021 s –1 kg –1. The integrated GBR count rate calculated for the main peaks in the energy range of 40 keV to 2.7 MeV was 0.028 s –1 kg –1 for Lab 5 instead of 0.095 s –1 kg –1 in Callio Lab. The present measurements showed that the GBR level in Lab 5 is significantly lower than that in Callio Lab. To characterise the GBR in Lab 5 on a low-background HPGe spectrometer, the background characteristics were measured with the lead lid of the low-background shield either Conclusions For example, the preliminary measurements using a MultiSPEC-6000 clustered CdZnTe spectrometer gave an integral count rate in the range of 30–2700 keV is 28.5 ± 0.01 s −1, which is around half the average in the Callio Lab. The background level in Lab 5 was evaluated using the same spectrometers as in (Gostilo et al., 2020). Lab 5 is part of the cooling and air exchange systems of the main level. The dimensions of the hall are 53 m × 11–13 m × 5–6 m (length × width × height), making it one of the largest halls in the mine, and its total estimated volume is approximately 3000 m 3. It was originally used as a storage facility (named KA1) for the mine. Lab 5 is located on the main level of the mine at a depth of 1410 m. The Pyhäsalmi Mine contains numerous spaces/caverns at various depths (Callio Lab, 2020). Section snippets Brief description of Lab 5
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