In the present study, ²²²Rn activity concentrations in a newly formed underground tourist route under Książ castle, Poland, were investigated for periods undisturbed and disturbed by construction works. This preliminary assessment is based on the almost 3-year long continuous measurements (28 Oct. 2016–02 Jul. 2019) done with an SRDN-3 instrument. In detail described are radon concentrations for periods of renovation (11 Aug. 2018–10 Oct. 2018), opening (15 Oct. 2018–10 Apr. 2019) and operation and monitoring (11 Apr. 2019–02 Jul. 2019) of the facility. It was observed that after the termination of construction work, when natural ventilation returned to the state preceding this work, the absolute values of radon activity concentration decreased. The mean annual radon concentrations were higher than the reference level of radon concentration in underground spaces recommended by IAEA, ICRP, and by the EU Council Directive for workplaces. They reached 1179 Bq/m³ and 943 Bq/m³ in 2017 and 2018, respectively. Cyclically recurring daily changes in radon concentrations occurred only in April and October (so-called transitional periods) and only outside the period of construction work. The results confirmed; however, that these changes need not be considered when planning the work in the tunnel. The minimum effective dose rate from radon exposure occurs in colder periods of the year, from November to the end of March, where the mean effective dose rate value was found to be 0.0003 mSv/h. In contrast, the maximum dose rate of 0.014 mSv/h was observed from April to August.

在本研究中，对波兰 Książ 城堡下新形成的地下旅游路线中的²²² Rn 活动浓度进行了未受干扰和受建筑工程干扰的时期的调查。该初步评估基于使用 SRDN-3 仪器进行的近 3 年的连续测量（2016 年 10 月 28 日至 2019 年 7 月 2 日）。详细描述了改造（2018年8月11日至2018年10月10日）、开放（2018年10月15日至2019年4月10日）以及运行和监测（2019年4月11日至2019年7月2日）期间的氡浓度。设施。据观察，施工结束后，当自然通风恢复到施工前状态时，氡活度浓度绝对值下降。年平均氡浓度高于 IAEA、ICRP 和欧盟理事会工作场所指令建议的地下空间氡浓度参考水平。2017年和2018年分别达到1179 Bq/m ³和943 Bq/m ³。氡气浓度每日周期性变化仅发生在四月和十月（所谓的过渡期）且仅发生在施工期之外。结果证实；然而，在规划隧道施工时无需考虑这些变化。氡暴露的最小有效剂量率发生在一年中较冷的时期，即从 11 月到 3 月底，平均有效剂量率为 0.0003 mSv/h。相比之下，4 月至 8 月观测到的最大剂量率为 0.014 mSv/h。