Ateba J F Beyala, Ateba P Owono, Ben-Bolie G H, Abiama P Ele, Abega C R, Mvondo S
Department of Physics, Faculty of Science, University of Yaoundé I, PO Box 812, Yaoundé, Cameroon.
Radiat Prot Dosimetry. 2010 Jun;140(1):81-8. doi: 10.1093/rpd/ncq035. Epub 2010 Feb 16.
The natural background doses due to (40)K, (226)Ra and (232)Th have been measured in soil samples collected from various sampling sites in the locality of Lolodorf, Cameroon. For data acquisition and analysis, a high-purity germanium detector and a PC-based MCA were used. The mean activity concentrations of (40)K, (226)Ra and (232)Th were measured to be 2001 +/- 521, 329 +/- 491 and 414 +/- 309 Bq kg(-1), respectively, in rock samples, while in soil samples the activity concentrations were found to be 1482 +/- 280 Bq kg(-1) for (40)K, 134 +/- 64 Bq kg(-1) for (226)Ra and 177 +/- 102 Bq kg(-1) for (232)Th. The average outdoor absorbed dose rates in air, 1 m above the ground surface due to soil samples, were estimated to be 218 +/- 61 and 250 +/- 97 nGy h(-1) in the locations of Ngombas and Bikoue, respectively. The corresponding annual effective dose rates in air were determined to be 0.267 mSv y(-1) in Ngombas and 0.307 mSv y(-1) in Bikoue. The level of radioactivity in the studied area is relatively high.
已对从喀麦隆洛洛多夫当地不同采样点采集的土壤样本中因（40）K、（226）Ra和（232）Th产生的天然本底剂量进行了测量。为了进行数据采集和分析，使用了一个高纯锗探测器和一台基于个人计算机的多道分析器。在岩石样本中，（40）K、（226）Ra和（232）Th的平均活度浓度分别测得为2001±521、329±491和414±309 Bq kg⁻¹，而在土壤样本中，（40）K的活度浓度为1482±280 Bq kg⁻¹，（226）Ra为134±64 Bq kg⁻¹，（232）Th为177±102 Bq kg⁻¹。由于土壤样本，在地面上方1米处空气中的平均室外吸收剂量率在恩贡巴斯和比库埃的地点分别估计为218±61和250±97 nGy h⁻¹。空气中相应的年有效剂量率在恩贡巴斯确定为0.267 mSv y⁻¹，在比库埃为0.307 mSv y⁻¹。研究区域的放射性水平相对较高。
