The Establishment of the On-site Calibration Device for 2πα and 2πβ Particle Emission Rate Measurement
LI Ze-xi1,2,HE Hai-jiang2,3,LIANG Jun-cheng2,SHAN Jian1,GAN Ya-zhou4,YANG Zhi-jie2,3,LIU Hao-ran2,ZHANG Ming2
1. School of Nuclear Science and Technology of University of South China, Hengyang, Hunan 421001, China
2. National Institute of Metrology, Beijing 100029, China
3. China University of Geosciences, Beijing 100083, China
4. CGN(Shenzhen) Radiation Monitoring Technology Co Ltd, Shenzhen, Guangdong 518124, China
Abstract：Based on a large-area, windowless, gas-flow proportional counter, an alpha/beta 2π emission rate on-site calibration device is established. Performance tests are taken and the results show that the plateau of alpha lasts from 700 V to 1 500 V, the length is up to 800V and the slope is 0.25% per 100V, the plateau of beta lasts from 1650V to 2050V, the length is up to 400V and the slope is 0.44% per 100V. This on-site calibration device is used to measure the standard surface sources which are calibrated by the the absolute alpha/beta 2π emission rate measuring system, the results are well agreed with the standard values within the range of uncertainties.On-site measurement of another group of standard surface sources are taken, values of corrected results are agreed with the values calibrated in previous cycles within the range of uncertainties, which verifies the feasibility of this calibration device to deliver the on-site standard values.
［1］梁珺成,李奇,柳加成,等. 2πα、2πβ粒子发射率的绝对测量［J］. 计量学报, 2016,37(2): 209-213.
［2］黄秋,方方,杨勇,等.2πα、2πβ粒子发射率副基准复现单位量值研究［J］. 核电子学与探测技术,2012,32(4):471-474.
［3］许荩,漆明森,程瑛,等.影响表面污染仪测量准确度的因素研究［C］//2010国防计量与测试学术交流会论文集,武汉, 2010.
［4］Wuu J L, Yuan M C, Su S H, et al. The alpha and beta emitter measurement system in INER［J］. Applied Radiation and Isotops, 2002, 56(s 1-2):261-264.
［5］King L E, Hutchinson J M R, Unterweger M P. A new large-aera 2π proportional counting system at NIST［J］. Applied Radiation and Isotops, 2008, 66(6-7):877-880.
［6］Hutchinson J M R, Bright S J. The NBS large-aera alpha-particle counting system［J］. Journal of Research of the National Bureau of Standards, 1987, 92(5):311-324.
［7］王金.基于C++Builder的系统可靠性信息采集处理软件设计［D］.兰州:兰州大学,2012.
［8］杨杰.数据采集系统中数据获取和处理的C++Builder实现［J］. 重庆工学院学报,2005,19 (3):51-54.
［9］饶文碧,陈旭辉,徐锐. 基于C++Builder的图形图像处理方法［J］. 交通与计算机,2002,20 (2):61-63.
［10］GB／T 16698—2008,α粒子发射率的测量大面积正比计数管法［S］.
［11］周丰群,杨景康,拓飞,等. HP Ge γ谱仪系统死时间校正方法的实验研究［J］. 高能物理与核物理,2005,(12):1175-1178.
［12］JJF 1059—1999,测量不确定度评定与表示［S］.
2017, Vol. 38 
