Jibiri N N, Okeyode I C
Department of Physics, University of Ibadan, Ibadan, Nigeria.
Radiat Prot Dosimetry. 2011 Nov;147(4):555-64. doi: 10.1093/rpd/ncq579. Epub 2011 Jan 10.
The concentrations of naturally occurring radionuclides in the sediments of the Ogun River in Southwestern Nigeria were measured using NaI(Tl) gamma-ray spectrometry. The measurements were made in an effort to better understand the spatial distribution of natural radioactivity and to form a database of radioactivity levels of the Ogun River. The total average activity concentrations of (40)K, (226)Ra and (232)Th in the sediment samples representing the whole Ogun River from the upper region through the middle to the lower region of the river were 499.476±59.167, 12.649±3.476 and 11.774±5.126, respectively. The range of the activity concentrations of (40)K, (226)Ra and (232)Th for the Ogun River were found to be from 370.969±19.261 (at Olopade) to 608.023±24.658 (at Owere), 5.567±2.359 (at Ekerin) to 20.395±4.516 (at Sokori) and 5.037±2.244 (at Mile 12-Maidan) to 23.096±4.806 (at Sokori). The values obtained were compared with internationally accepted values. No man-made radionuclides were detected at any of the locations.
采用碘化钠（铊）γ射线能谱法测量了尼日利亚西南部奥贡河沉积物中天然放射性核素的浓度。进行这些测量是为了更好地了解天然放射性的空间分布，并建立奥贡河放射性水平的数据库。代表奥贡河从上游地区经中游到下游整个区域的沉积物样本中，钾-40、镭-226和钍-232的总平均活度浓度分别为499.476±59.167、12.649±3.476和11.774±5.126。发现奥贡河钾-40、镭-226和钍-232活度浓度范围分别为370.969±19.261（在奥洛帕德）至608.023±24.658（在奥韦雷）、5.567±2.359（在埃克林）至20.395±4.516（在索科里）以及5.037±2.244（在12英里-迈丹）至23.096±4.806（在索科里）。将所得值与国际认可值进行了比较。在任何位置均未检测到人造放射性核素。
