摘要
我国东南四省广泛分布着大量的富铀花岗岩,是氡的高本底区.人防工程因其建于地下,室内氡浓度受本底值影响更大.为了解该地区地下人防工程内氡的浓度水平及可能对人体产生的危害,文章对该区11个城市30个不同类型的人防工程室内氡浓度进行了约24小时连续测定,测定结果为11.1～344.1 Bq·m-3,平均值为70.5Bq·m.为探讨工程的地质概况、被覆程度、被覆材料及通风程度对室内氡浓度的影响,根据工程被覆程度及人员使用频繁程度将其分为四类:地下停车场(Ⅰ类);超市,办公室等(Ⅱ类);被覆坑道(Ⅲ类);毛洞(Ⅳ类).各类工程的氡浓度平均值分别为29.6、33.7、84.4、137.5 Bq·m-3.
Widespread in the four provinces of Southeast China are U-rich granites, with a high-radon background. The radon level in underground space is higher than that above ground. This paper summarizes the work carried out in underground spaces in the high-radon background regions and reports the preliminary results of an ongoing study. Radon concentrations in 30 underground spaces in 11 cities were detected by a Model 1027 continuous monitor. The radon concentrations in 30 underground spaces range from 11. 1-344. 1 Bq·m-3 with an overall arithmetic mean value of 70. 5 Bq·m-3. Thirty underground spaces were classified as four types: underground garages (Ⅰ); underground supermarkets and offices (Ⅱ); covered tunnels (Ⅲ); and uncovered tunnels (Ⅳ). The influence on radon level from the urban circumstances such as geological formation, covering level, covering materials and ventilation situation were also discussed.
出处
《地球与环境》
CAS
CSCD
2004年第3期67-71,共5页
Earth and Environment
关键词
东南四省
花岗岩
人防工程
氡
Southeast China
granite
underground space
radon
