| 中国几个地区土壤中239,240Pu、241Am和137Cs等放射性核素的测定 |
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| 中文关键词 环境监测 239,240Pu 241Am 137Cs 土壤 |
| 英文关键词 plutonium americium cesium tadionuclide |
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| 中文摘要 |
| 分别从北京、太原、石家庄和济南地区采集了深度为0-5和5-20cm的土壤样品,进行了239,240Pu、241Am、137Cs、40K以及天然铀、钍系放射性核素的测定.估计了样品中放射性核素的水平和分布.结果表明,239,240Pu、241Am和137Cs 的平均累积沉降量分别为24+13、10±5和1230±700MBq/km2.239,240Pu/137Cs活度比为0.016—0.026(平均值0.020±0.004),214Am/239,240Pu活度比为0.35—0.49(平均值0.43±0.05).还讨论了这些核素与土壤中“过剩”210Pb之间的关系. |
| 英文摘要 |
| The surface soil samples with a set of 0-5cm and 5-20 cm depth were collected from Beijing,Taiyuan, Shijiazhuang, and Jinan of China in early 1990. The samples were analyzed for 239,240Pu, 241Am and 137Cs. including naturally occurring radionuclides, to estimate their present levels and distributions. From these results, the average accumulated depositions were estimated roughly to be 24±13MBq/km2 for 239,240Pu, 10±5MBq/km2 for 241 Am and 1. 2±0. 7GBq/km2 for 137Cs, respectively. The activity ratios, of 239,240Pu/137Cs and 241Am/239,240Pu ranged from 0.016 to 0.026 (with a mean value of 0.020±0.004) and 0.35 to 0.49(with a mean value of 0.43±0.05), respectively. The relation between the inventories of these nuclides and excess210Pb in soils was also discussed. |
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