摘要
为提高检测建筑材料中放射性核素^(232)Th、^(226)Ra、^(40)K含量的准确性,利用低本底NaI(TI)γ谱仪就样品的粒径、含水量、封样时间对检测结果的影响进行了实验研究。结果表明:样品粒径、含水量、封样时间影响建材中放射性核素含量和内、外照射系数测量数据,且内、外照射系数随样品条件变化呈现一定变化的规律;当样品满足粒径小于0.16 mm、含水量0%、封样时间不小于10 d的条件时,测量的结果能够较好地反映建材的放射性;如果不满足条件,则应该对测量的数据进行相应的修正。
In order to improve the measurement accuracy of 40K, 226Ra and 232Th in the building materials, low background NaI （TI） y spectrometer was used to study influence of sample size, sample water content and sample sealing time to testing results. The results show sample size, sample water content and sample sealing time affect testing data of radioactive nuclide content and radiation coefficient of the material, the internal and external radiation coefficient changes with change of sample conditions. When the size of sample is less than 0.16 mm, water content is 0% and sealing time is not less than ten days, the testing results are well reflect radioac- tivity of building material. If samples can not meet the conditions, the results need corresponding correction.
出处
《核电子学与探测技术》
CAS
北大核心
2015年第10期1007-1010,共4页
Nuclear Electronics & Detection Technology
基金
国家级大学生创新创业训练计划项目(201410555009)资助
关键词
建材放射性
样品粒径
含水量
实验研究
building materials radioactivity
sample size
water content
experimental study
