切尔诺贝利事故后尼罗河三角洲及周边地区90锶和137铯的分布模式。

Distribution pattern of 90Sr and 137Cs in the Nile delta and the adjacent regions after Chernobyl accident.

作者信息

Shawky S, el-Tahawy M

机构信息

National Center for Nuclear Safety and Radiation Control, Atomic Energy Authority of Egypt, Cairo, Egypt.

出版信息

Appl Radiat Isot. 1999 Feb;50(2):435-43. doi: 10.1016/s0969-8043(97)10128-2.

DOI:10.1016/s0969-8043(97)10128-2

PMID:10081145

Abstract

Strontium and cesium contents in surface soil samples across the Nile Delta and the north coast of Egypt after the Chernobyl accident have been investigated. The concentration of 137Cs and 90Sr was determined using a high resolution gamma spectrometer based on hyperpure germanium detector (HPGe) and a liquid scintillation counter (LSC) respectively. 90Sr was determined through its decay product 90Y using Cerenkov counting. The determination of 90Sr was based on tributylphosphate (TBP) extraction of yttrium from nitric acid extract of ashed samples. The radioactivity of soils ranged between 18.5 and 2175 Bq/m2 with a mean of 652 Bq/m2 and 234 and 3129 Bq/m2 with a mean of 760 Bq/m2 for 137Cs and 90Sr respectively. An estimated absorbed dose equivalent due to the measured deposit of 137Cs was found to be 0.062 murem/h.

摘要

对切尔诺贝利事故后埃及尼罗河三角洲和北海岸表层土壤样本中的锶和铯含量进行了调查。分别使用基于高纯锗探测器（HPGe）的高分辨率伽马能谱仪和液体闪烁计数器（LSC）测定了137Cs和90Sr的浓度。90Sr通过其衰变产物90Y使用切伦科夫计数法进行测定。90Sr的测定基于用磷酸三丁酯（TBP）从灰化样品的硝酸提取物中萃取钇。土壤的放射性活度范围为18.5至2175 Bq/m²，137Cs的平均值为652 Bq/m²，90Sr的放射性活度范围为234至3129 Bq/m²，平均值为760 Bq/m²。发现由于测量到的137Cs沉积而产生的估计吸收剂量当量为0.062毫雷姆/小时。