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| The Establishment of Radiation Primary Standard in the Range of Low Energy X-rays |
| WU Jin-jie1,WANG Pei-wei1,DUAN Xiao-juan1,2,LI Bing1,2,YANG Yuan-di1 |
1.National Institute of Metrology, Beijing 10013, China
2.Chengdu University of Technology, Chengdu, Sichuan 610059, China |
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Abstract The radiation equipment for air-kerma primary standard in the range of low-energy X-rays is established.The results of experiment show that the diameter of the radiation field is more than 40 mm within 1% non-uniformity.The distance from the source to the reference plane is 1 000 mm.Radiation qualities recommend by CCRI are established.The half value layer(HVL)and the homogeneity coefficient are obtained by measuring the curve of x-rays attenuation.This low-energy X-rays radiation equipment and research results are the important base of establishing primary standard,realization of air-kerma and the APMP key comparison in the range of low-energy X-rays(APMP.RI(I)-K2).
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［2］NIMJ,Technical protocol for APMP key comparison of air kerma standards for the CCRI reference qualities and the ISO 4037 narrow spectrum series in the low-energy x-ray region［EB］,http://kcdb.bipm.org/,2010.
［3］ISO 4037-1, X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy-Part1: Radiation characteristics and production methods［S］.1996.
［4］BIPM,Qualities de rayonnement ［R］,CCEMRI(I),1972. |
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2011, Vol. 32 
