Faculty of Civil Engineering, Wrocław University of Science and Technology, Wybrzeże S. Wyspiańskiego 27, 50-370, Wrocław, Poland.
Faculty of Geoengineering, Mining and Geology, Wrocław University of Science and Technology, Wybrzeże S. Wyspiańskiego 27, 50-370, Wrocław, Poland.
Radiat Environ Biophys. 2021 May;60(2):329-345. doi: 10.1007/s00411-021-00903-z. Epub 2021 Mar 19.
In the present study, Rn 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/m and 943 Bq/m 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，调查了波兰克什丘夫城堡下一条新形成的地下旅游路线在不受和受建筑工程干扰的情况下的 Rn 活度浓度。该初步评估基于使用 SRDN-3 仪器进行的近 3 年连续测量（2016 年 10 月 28 日至 2019 年 7 月 2 日）。详细描述了翻新期（2018 年 8 月 11 日至 2018 年 10 月 10 日）、开放期（2018 年 10 月 15 日至 2019 年 4 月 10 日）和运营及监测期（2019 年 4 月 11 日至 2019 年 7 月 2 日）的氡浓度。结果表明，在施工工作结束后，当自然通风恢复到施工前的状态时，氡活度浓度的绝对值降低。年平均氡浓度高于国际原子能机构、国际辐射防护委员会和欧盟理事会指令为工作场所推荐的地下空间氡浓度参考水平。2017 年和 2018 年分别达到 1179 Bq/m 和 943 Bq/m。氡浓度的周期性日变化仅在 4 月和 10 月（所谓的过渡时期）发生，而且仅在施工期之外。结果证实，然而，在规划隧道内的工作时，不必考虑这些变化。氡暴露的最小有效剂量率发生在一年中较冷的时期，从 11 月到 3 月底，在此期间发现平均有效剂量率值为 0.0003 mSv/h。相比之下，从 4 月到 8 月，观察到最大剂量率为 0.014 mSv/h。
