论文部分内容阅读
对北京西山某岩溶洞穴1至4层进行了氡浓度测量,研究洞穴中氡浓度的变化特征,从时间和空间两个方面探讨其变化规律及其对人身体的危害。研究结果表明,天然溶洞在不同深度位置,氡浓度存在明显差异,随着深度的增加,氡浓度呈现线性的增长特征;溶洞内氡浓度在7、8、9月相对较高,平均浓度6123Bq/m~3,10、11、12月氡浓度较低,平均浓度2784Bq/m~3,呈现出季节性的变化特征,即夏季高而冬季低;溶洞内由氡及其子体所产生的年平均内照射剂量约为566 m Sv·a~(-1),超出国家规定公众年有效剂量的安全范围。建议对已经对公众开放的天然溶洞,进行氡浓度检测,采取有效的防氡降氡措施,减少氡及其子体的辐射,对人身体所产生的危害。
The radon concentration was measured in the first to the fourth floor of a karst caves in the Western Mountain of Beijing to study the variation characteristics of radon concentration in the caves, and to explore its changing law and its harm to the human body from two aspects of time and space. The results show that there are significant differences in radon concentration at different depths of natural karst cave. With the increase of depth, the radon concentration presents a linear growth characteristic. The radon concentration in the karst cave is relatively high in July, August and September with an average concentration of 6123Bq / The concentrations of radon in m ~ 3, 10, 11 and 12 were lower with an average concentration of 2784Bq / m ~ 3, showing a seasonal variation, ie summer high and low winter; The average internal dose is about 566 mSv · a ~ (-1), which is beyond the safe range of public annual effective dose prescribed by the state. It is suggested to measure the radon concentration in natural caves that have been opened to the public and to take effective measures to prevent radon from lowering radon so as to reduce the harm to human body caused by radon and its daughters’ radiation.