DPAM, PIEAS, Islamabad, Pakistan.
J Environ Radioact. 2011 Jan;102(1):35-42. doi: 10.1016/j.jenvrad.2010.08.010. Epub 2010 Sep 24.
Concentration of radionuclides ²¹⁰Pb and ⁷Be, having half lives of 22.3 years and 53.29 days, respectively, in the surface air samples of Islamabad (33.38°N, 73.10°E and Altitude ∼536 m asl.) are measured. The non-destructive technique of gamma-spectrometry, with a high purity germanium HPGe detector, was employed for the analysis of all samples. The annual average concentrations of ²¹⁰Pb and ⁷Be in the surface air samples were determined as 0.284 ± 0.15 and 3.171 ± 1.14 mBq m⁻³, respectively. Our results have shown a seasonal variation of the concentration of ⁷Be in air samples with high values for the spring season. High concentrations for ²¹⁰Pb are obtained when air masses originate from plain areas of Pothohar region, located in the South-West, West and North West of Islamabad. Our values of concentrations show a nice agreement with the relevant reported results.
²¹⁰Pb 和 ⁷Be 的放射性核素浓度，半衰期分别为 22.3 年和 53.29 天，在伊斯兰堡（33.38°N，73.10°E 和海拔约 536 m）的地表空气样本中进行了测量。采用高纯锗 HPGe 探测器的非破坏性伽马能谱技术对所有样本进行了分析。地表空气样本中 ²¹⁰Pb 和 ⁷Be 的年平均浓度分别确定为 0.284 ± 0.15 和 3.171 ± 1.14 mBq m⁻³。我们的结果表明，⁷Be 浓度在空气样本中存在季节性变化，春季浓度较高。当空气团源自位于伊斯兰堡西南、西部和西北部的普赫图赫瓦地区的平原地区时，²¹⁰Pb 的浓度较高。我们的浓度值与相关报道的结果非常吻合。
