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| 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 |
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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.
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Received: 01 June 2016
Published: 28 December 2016
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2017, Vol. 38 
