Khan Hasan M, Ismail Muhammad, Zia Muhammad Abid, Khan Khalid
National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan.
Isotopes Environ Health Stud. 2012 Jun;48(2):295-301. doi: 10.1080/10256016.2012.641963. Epub 2012 Mar 7.
The analysis of gamma-emitting radionuclides in nature, i.e. (226)Ra, (232)Th, (40)K and (137)Cs, has been carried out in soil samples collected from Peshawar University Campus and surrounding areas using a high purity germanium detector coupled with a computer-based high-resolution multichannel analyser. The activity concentrations in soil ranged from 30.20±0.65 to 61.90±0.95, 50.10±0.54 to 102.80±1.04, 373.60±4.56 to 1082±11.38 and 9.50±0.11 to 46.60±0.42 Bq kg(-1) for (226)Ra, (232)Th, (40)K and (137)Cs, with a mean value of 45±7.70, 67±12.50, 878±180 and 19±9.20 Bq kg(-1), respectively. The radium equivalent activity, internal and external hazard indices have mean values of 203.40±29.40 Bq kg(-1), 0.56 and 0.68, respectively. The mean values of outdoor and indoor absorbed dose rates in air and the annual effective dose equivalents were found to be 106.50 and 128 nGy h(-1) and 0.19 and 0.54 mSv y(-1), respectively. In the present study, (40)K was the major radionuclide present in soil samples. The presence of (137)Cs indicates that this area also received some fallout from the nuclear accident of the Chernobyl power plant in 1986. The activity concentrations of radionuclides found in soil samples during the current investigation were nominal. Therefore, they are not associated with any potential source of health hazard to the public.
利用配备计算机化高分辨率多通道分析仪的高纯锗探测器，对从白沙瓦大学校园及周边地区采集的土壤样本中的天然γ发射放射性核素，即（226）镭、（232）钍、（40）钾和（137）铯进行了分析。土壤中（226）镭、（232）钍、（40）钾和（137）铯的活度浓度范围分别为30.20±0.65至61.90±0.95、50.10±0.54至102.80±1.04、373.60±4.56至1082±11.38以及9.50±0.11至46.60±0.42贝克勒尔每千克，其平均值分别为45±7.70、67±12.50、878±180和19±9.20贝克勒尔每千克。镭当量活度、内照射和外照射危害指数的平均值分别为203.40±29.40贝克勒尔每千克、0.56和0.68。室外和室内空气中的吸收剂量率平均值以及年有效剂量当量分别为106.50和128纳戈瑞每小时以及0.19和0.54毫希沃特每年。在本研究中，（40）钾是土壤样本中存在的主要放射性核素。（137）铯的存在表明该地区也受到了1986年切尔诺贝利核电站核事故的一些沉降物影响。在本次调查中，土壤样本中发现的放射性核素活度浓度处于正常水平。因此，它们与任何对公众健康的潜在危害源均无关联。
