为了评估公众对氡的暴露,thoron,和他们的后代,在喀麦隆西部Fongo-Tongo铝土矿丰富地区的50所住宅中进行了测量。采用无源积分氡-胸判别探测器(特别是RADUET)进行氡和胸测量。此外,使用基于LR-115检测器的直接Radon后代传感器(DRPS)和直接Thoron后代传感器(DTPS)估算了短寿命the和thoron后代的浓度。研究结果表明,室内氡浓度范围为31至123Bqm-3,几何平均值(GM)为62Bqm-3,室内氡浓度范围为36至688Bqm-3,GM为242Bqm-3。平衡当量氡浓度(EERC)范围为3至86Bqm-3,GM为25Bqm-3,而平衡当量Thoon浓度(EETC)范围为1.2至12.5Bqm-3,GM为7.6Bqm-3。值得注意的是,所有住宅记录的氡浓度低于100Bqm-3。氡和胸平衡因子的算术平均值分别为0.47和0.04。评估氡和胸腔吸入的年有效剂量,平衡因子与EERC和EETC的直接测量一起使用。观察到的the年有效剂量差异为4.5%,为42.5%。此外,钍及其衰变产物对氡年有效剂量的贡献,thoron,他们的后代从12%到94%不等,平均贡献率为58%。因此,这项研究发现,在研究区域,由于胸部吸入的有效剂量超过了由于氡吸入的有效剂量。结论是,在评估辐射剂量和健康风险时,至关重要的是要同时考虑thoron及其后代以及the及其后代。这强调了考虑直接测量以准确估计辐射剂量的重要性。
To assess public exposure to radon, thoron, and their progeny, measurements were conducted in 50 dwellings within the bauxite-rich area of Fongo-Tongo in western Cameroon. Passive integrating radon-thoron discriminative detectors (specifically RADUET) were employed for radon and thoron measurements. Additionally, concentrations of short-lived radon and thoron progeny were estimated using Direct Radon Progeny Sensors (DRPSs) and Direct Thoron Progeny Sensors (DTPSs) based on LR-115 detectors. The findings revealed indoor radon concentrations ranging from 31 to 123 Bq m-3 with a geometric mean (GM) of 62 Bq m-3, and indoor thoron concentrations ranging from 36 to 688 Bq m-3 with a GM of 242 Bq m-3. The Equilibrium Equivalent Radon Concentration (EERC) ranged from 3 to 86 Bq m-3 with a GM of 25 Bq m-3, while the Equilibrium Equivalent Thoron Concentration (EETC) ranged from 1.2 to 12.5 Bq m-3 with a GM of 7.6 Bq m-3. Notably, all dwellings recorded radon concentrations below 100 Bq m-3. Arithmetic means of radon and thoron equilibrium factors were calculated as 0.47 and 0.04, respectively. To assess annual effective doses from radon and thoron inhalation, equilibrium factors were used along with direct measurements of EERC and EETC. The differences observed in annual effective doses were 4.5% for radon and 42.5% for thoron. Furthermore, the contribution of thoron and its decay products to the annual effective dose from radon, thoron, and their progeny ranged from 12 to 94%, with an average contribution of 58%. Thus, this study found that the effective dose due to thoron inhalation in the study area exceeded that due to radon inhalation. It is concluded that, when evaluating radiation doses and health risks, it is crucial to consider both thoron and its progeny alongside radon and its progeny. This underscores the importance of considering direct measurements for accurately estimating radiation doses.