Abdellah W M, Diab H M, El-Kameesy S U, Salama E, El-Framawy S
a Radiation Protection Department , Nuclear and Radiological Regulatory Authority , Cairo , Egypt.
b Physics Department, Faculty of Science , Ain Shams University , Cairo , Egypt.
Isotopes Environ Health Stud. 2017 Aug;53(4):427-439. doi: 10.1080/10256016.2017.1293668. Epub 2017 Mar 13.
Twenty soil and 25 sediment samples were collected from the banks and bottom of the River Nile in the surroundings of biggest cities located close to it. Natural radioactivity concentrations of Ra, Th and K have been evaluated for all samples by means of γ spectrometric analysis. The radioactivity levels of soil and sediment samples fall within the internationally recommended values. Nevertheless, high natural background radiation zones are detected in the Kafr El-Zayat region due to the presence of a fertilizer factory, and in the Rosetta region due to the presence of black sand deposits. The absorbed dose rate, the γ index and excess life time cancer risk are calculated. High values for some of the radiation health parameters are detected in the Kafr El-Zayat and Rosetta regions representing a serious problem to public health because the soil and sediment are used as constructing material for buildings. Furthermore, the isotope analysis of uranium for representative collected sediment samples via α spectrometry showed average specific activities of 18.7 ± 3.6, 0.087 ± 0.0038 and 18.6 ± 3.8 Bq kg for U, U and U, respectively. In general, these values confirm the balance in the isotopic abundance of U isotopes.
从尼罗河沿岸及周边最大城市附近区域的河岸和河底采集了20份土壤样本和25份沉积物样本。通过γ能谱分析对所有样本中的镭（Ra）、钍（Th）和钾（K）的天然放射性浓度进行了评估。土壤和沉积物样本的放射性水平均在国际推荐值范围内。然而，由于一家化肥厂的存在，在卡夫尔宰亚特地区检测到高天然本底辐射区；由于黑砂沉积物的存在，在罗塞塔地区也检测到高天然本底辐射区。计算了吸收剂量率、γ指数和额外终生癌症风险。在卡夫尔宰亚特和罗塞塔地区检测到一些辐射健康参数的高值，这对公众健康构成严重问题，因为土壤和沉积物被用作建筑材料。此外，通过α能谱法对代表性沉积物样本进行铀同位素分析，结果显示铀-238、铀-235和铀-234的平均比活度分别为18.7±3.6、0.087±0.0038和18.6±3.8 Bq/kg。总体而言，这些值证实了铀同位素丰度的平衡。
