摘要
标准氡室是为测氡仪量值溯源提供参考氡气的装置,氡室氡体积活度值可以由氡源活度、氡产生率和氡室容积等参数进行计算获得,但因吸附、泄漏等因素而存在误差,因而必须用标准仪器准确测量。影响标准氡室内氡体积活度值测量结果的主要因素有氡与子体的平衡、测量仪器的校准因子、测量重复性与氡体积活度的均匀性、稳定性等;氡室氡体积活度的测量应在氡与子体平衡达到后进行,测量时应扣除本底,选用较长的测量时间和适当的测量次数,取测量平均值。
Standard radon chamber is the radon system which gives the reference to the radon measurement. The radon concentration can be calculated by the factors such as the activity of the radon source, the rate of the ra- don production and the volume of the radon chamber. However, because of some reasons such as radon absorp- tion, leaking which lead to the error of the measurement, so the measurement shall be done by the standard in- strument. The main reasons which influence the radon concentration in the standard radon chamber are the bal- ance between the radon and its daughters, the calibration factor of the measurement instrument, repetitiveness of the measurement and the uniformity and stability of the radon concentration. Once measuring the radon con- centration, the measurement should be done after reaching the balance between the radon and its daughters, the results should deduct the background, and taking longer measuring time and more measuring times to get the av- erage result.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2013年第10期1199-1202,共4页
Nuclear Electronics & Detection Technology
基金
国家质检总局科技计划项目(2007QK105)
关键词
标准氡室
氡体积活度
校准因子
稳定性
均匀性
standard radon chamber
radon concentration
calibration factor
stability
uniformity
