Campos M P, Pecequilo B R S, Mazzilli B P
Instituto de Pesquisas Energéticas e Nucleares, Cidade Universitária, São Paulo, SP, Brazil.
Radiat Prot Dosimetry. 2010 Sep;141(2):210-4. doi: 10.1093/rpd/ncq167. Epub 2010 May 31.
Termas de Araxá spa is located in Araxá, State of Minas Gerais. In this region, several minerals rich in uranium and thorium are found. The mineral waters and mud from Termas de Araxá spa have been used for therapeutic and recreation purposes. In this study, the committed effective dose was evaluated for workers and patients at Araxá spa due to (222)Rn and (212)Pb inhalation. Radon measurements were carried out through the passive method with solid state nuclear track detectors (Makrofol E) over a period of 21 months, with results varying from 258 +/- 20 to 1634 +/- 111 Bq m(-3). The (212)Pb air concentration was assessed through the modified Kusnetz's method, the results varying from 0.3 +/- 0.1 to 2.1 +/- 0.2 Bq m(-3). Doses received by the spa workers are below 20 mSv.y(-1), suggested by ICRP 60 as an annual effective dose limit for occupational exposure. The radiation doses for the patients are below the mean annual effective dose due to natural sources estimated to be 2.4 mSv.y(-1).
阿拉沙温泉浴场位于米纳斯吉拉斯州的阿拉沙市。在该地区发现了几种富含铀和钍的矿物质。阿拉沙温泉浴场的矿泉水和泥浆已被用于治疗和娱乐目的。在本研究中，对阿拉沙温泉浴场的工作人员和患者因吸入（222）Rn和（212）Pb而产生的待积有效剂量进行了评估。使用固态核径迹探测器（Makrofol E）通过被动方法进行了为期21个月的氡测量，结果在258±20至1634±111 Bq m(-3)之间变化。通过改进的库斯内茨方法评估了（212）Pb的空气浓度，结果在0.3±0.1至2.1±0.2 Bq m(-3)之间变化。温泉浴场工作人员所接受的剂量低于国际放射防护委员会第60号出版物建议的20 mSv.y(-1)的职业照射年有效剂量限值。患者所接受的辐射剂量低于估计为2.4 mSv.y(-1)的天然源平均年有效剂量。
