室内暴露于电离辐射,特别是氡及其后代的放射性核素,由于与人肺组织的相互作用,吸入时会产生严重的健康风险。此外,空气电离主要是由于这些放射性核素。因此,需要精确测量氡活动浓度及其短寿命后代,以评估剂量和环境污染,并估计室内环境中的电离率。为此,我们采用了以前经过测试和批准的可靠方法,遵循三计数过程。此方法基于在聚碳酸酯膜过滤器上进行机载the子代采样,并使用带有CR-39检测器的被动α剂量测定技术进行α计数。该方法还依赖于我们开发的基于PC的软件,用于求解数学方程并计算所有必要的物理量。在这项研究中,在萨那的20所房屋中测量了氡浓度和个体短命氡子体,也门。考虑了测量条件和气象变量。222Rn的平均活性浓度,平衡当量浓度(EEC),218Po,214Pb,214Po分别为73.1±6.0、29.2±2.4、44.4±3.6、30.5±2.5和23.2±1.9Bq。分别为m-3。计算的平均未附着分数f1(218Po),f2(214Pb),和fp分别为0.24、0.04和0.07%。222Rn及其子代和空气离子浓度引起的离子对生产率的年平均值,是27.25个离子。cm-3s-1和1829离子。cm-3分别。年有效剂量估计为1.93±0.16mSv。y-1,远低于建议的10mSv。y-1.
Exposure to ionizing radiation inside houses, especially radionuclides of radon and its progeny, poses serious health risks that can be exacerbated when inhaled as a result of interaction with human lung tissue. Also, air ionization is mainly due to these radionuclides. Therefore, accurate measurements of radon activity concentrations and its short-lived progeny are required to assess dose and environmental pollution and estimate ionization rates in indoor environments. For this purpose, we employed a previously tested and approved reliable method, following the three-count procedure. This method is based on airborne radon progeny sampling on polycarbonate membrane filters and alpha counting using a passive α-dosimetry technique with CR-39 detectors. The method also relies on a PC-based software we developed for solving mathematical equations and calculating all the necessary physical quantities. In this study, the concentrations of radon and individual short-lived radon progeny were measured in 20 houses in Sana\'a, Yemen. Measurement conditions and meteorological variables were considered. The average activity concentrations of 222Rn, Equilibrium-Equivalent Concentration (EEC), 218Po, 214 Pb, and 214Po were 73.1 ± 6.0, 29.2 ± 2.4, 44.4 ± 3.6, 30.5 ± 2.5, and 23.2 ± 1.9 Bq.m-3, respectively. The calculated average unattached fractions f1(218Po), f2(214 Pb), and fp were found to be 0.24, 0.04, and 0.07 % respectively. The annual average values of ion-pair production rate caused by 222Rn and their progeny and air ion concentration, were 27.25 ions.cm-3s-1 and 1829 ions.cm-3 respectively. The annual effective dose was estimated to be 1.93 ± 0.16 mSv.y-1, well lower than the recommended 10 mSv.y-1.