Faculty of Science, University of Guilan, P.O.Box 3489, Rasht, Iran.
Environ Monit Assess. 2012 May;184(5):3053-62. doi: 10.1007/s10661-011-2170-z. Epub 2011 Jun 29.
In a comprehensive program of environmental radioactivity survey in South Caspian region, (137)Cs inventories in soil has been measured at more than 50 sites in the Iranian northern province of Guilan. This has been the first wide-range survey of soil radionuclide inventories in the narrow band sensitive ecosystem of south Caspian shore. Radioactivity measurements were carried out using HPGe gamma-spectrometry system. The activity concentration of (137)Cs in surface soil exhibits a mean value of 17.6 ± 9.4 Bq kg(-1), with a range of 2.3-41.7 Bq kg(-1). In many sites, split-level sampling method has been applied down to a depth of 20 cm. There were found generally two profiles. Most profiles exhibit a negative exponential distribution, while others revealed a clear subsurface peak in 5-10-cm layer. Cesium deposition in the study area has been estimated to be in the range of 0.38-2.9 kBq m(-2) with a mean value of 1.7 kBq m(-2). Distribution patterns of (137)Cs concentration levels and deposition values have been estimated using Kriging interpolation method. Observed hotspots in deposition pattern coincide with areas of higher precipitation.
在对里海南部地区环境放射性的综合调查中，在伊朗北部省份吉兰的 50 多个地点测量了土壤中的（137）Cs 活度。这是对里海南岸狭窄敏感生态系统中土壤放射性核素活度的首次大范围调查。放射性测量使用 HPGe 伽马能谱系统进行。表层土壤中（137）Cs 的活度浓度平均值为 17.6±9.4 Bq kg-1，范围为 2.3-41.7 Bq kg-1。在许多地点，采用了分层采样法，深度达 20 厘米。通常发现有两个剖面。大多数剖面呈负指数分布，而其他剖面在 5-10 厘米层中则显示出明显的次表层峰值。研究区的铯沉积量估计在 0.38-2.9 kBq m-2 之间，平均值为 1.7 kBq m-2。使用克里金插值法估计了（137）Cs 浓度水平和沉积值的分布模式。沉积模式中的热点与降水较多的地区相吻合。
