Study on Sampling Technique of Atmospheric Radi- onuclide

• 作者: Chen Liyun Dang Haijun Li Zhiming Liu Longbo Shi Quanlin Tang Hanbing Wu Shan Wu Yanmin Xie Feng Zhang Changyun
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: 大气颗粒 抽样技术 放射性核素监测 全面禁止核试验条约 气体采样器 最低检出浓度 氙同位素 采样技术
• 年，卷（期）: 2014,（6）
• 页码范围: 1-3
• 页数: 3页
• 分类号: X831.01

摘要

Atmospheric radionuclide monitoring usually includes two sampling techniques,namely ultra-high volume aerosol samplers to collect atmospheric particles by using filter media,and radioactive noble gas samplers to collect atmospheric noble gas based on adsorption method. Atmospheric sampling techniques have been researched in Northwest Institute of Nuclear Technology since the Comprehensive Nuclear-Test-Ban Treaty( CTBT) was signed in 1996. Several ultra-high volume aerosol samplers and some types of radioactive xenon isotopes samplers had been developed. For the aerosol sampler,the sampling flow is between 450 and 800 m3/h,with the minimum detectable concentration( MDC) of131 I less than5 μBq /m3. For the xenon sampler,the sampling capacity of xenon is more than 4 ml per day,with MDC of133 Xe less than 0. 25 mBq /m3. After the nuclear accident of Fukushima in 2011,monitoring of the atmospheric radionuclide was carried out for 3 months at Xi’an,and part of radionuclide was detected with concentrations higher than their backgrounds in the period,including131 I,134Cs,137 Cs and133Xe.