New SRDN-3 probes with a semi-conductor detector for measuring radon activity concentration in underground spaces

Short-term <sup>222</sup>Rn activity concentration changes in underground spaces with limited air exchange with the atmosphere

“…with its radioactive daughters, is responsible for about 40−50% of (1 -2.5 mSv/year) which a typical person receives from all natural sources of ionising radiation within a year (Commission 1990;UNSCEAR, 2000;Waligórski, 2010 Przylibski and Fijałkowska-Lichwa, 2010;Gillmore et al, 2001Gillmore et al, , 2002Chibowski and Komosa, 2001;Kullab et al, 2001;Kávási et al, 2003;Papachristodoulou et al, 2004;Perrier et al, 2004a, b;Olszewski et al, 2005;Lario et al, 2005Lario et al, , 2006Gervino et al, 2007;Lu et al, 2009;. Their findings have turned out to be comparable, and the most recent studies only extend the previously known regularities to next underground spaces.…”

Application of spectral decomposition of 222Rn activity concentration signal series measured in Niedźwiedzia Cave to identification of mechanisms responsible for different time-period variations

“…Such a powering method enables unmanned measurement regime over a period of at least one year with a possibility of recording the measured parameters ( 222 Rn activity concentration, temperature, and relative humidity) with 60-min data recording frequency. The lower detection limits of SRDN À3 probes for a 60-min data recording mode, the maximum measurable 222 Rn activity concentration and the calibration coefficient are about 90 Bq m -3 , about 157 MBq m -3 and about 35-45 Bq/m 3 /imp./h respectively, depending on the specimen of the probe (Przylibski et al, 2010).…”

“…A detailed description of 222 Rn activity concentration measurement method using SRDN-3 probes was included in reports by Przylibski et al (2010) and by Fijałkowska-Lichwa and Przylibski (2011).…”

The assessment of lining structure impact on radon behaviour inside selected underground workings under the cour d’honneur of Książ castle

“…The probes are Polishmade devices equipped with semiconductor detectors frequently used in long-term measurements conducted in underground spaces [21,22,84,85] including the tunnels under the cour d'honneur of Książ castle [24,71]. The construction and the operation principle of the SRDN-3 probe have been repeatedly discussed in publications, and its detailed description was included in the work by Przylibski and co-authors [84]. The 222 Rn activity concentration detection thresholds for SRDN-3 probes range The semiconductor SRDN-3 detectors were positioned on tripods at the height of 1 m over the floor of each corridor ( Fig.…”

“…The measurement uncertainty depends on the size of the measured 222 Rn activity concentration and it may range from 21 to 39%. The higher the value of 222 Rn activity concentration, the lower the measurement concentration, starting from 20% for 222 Rn values of the order of 1000 Bq/m 3 to even 7% for the value in the range of 5000-10,000 Bq/m 3[23,84].…”