The NIM-IAEA Bilateral Comparison on the Air Kerma and Absorbed Dose to Water of 60Co γ Radiation
JIN Sun-jun1,WANG Zhi-peng1,2,WANG Kun1,YANG Xiao-yuan1,HUANG Jin-feng3, FAN Yao-dong1,CHANG Xue1,ZHANG Jian1
1. National Institute of Metrology, Beijing 100029, China
2. Anhui University of Science & Technology,Huainan, Anhui 232000, China
3. Shenyang Metrology Testing Institution, Shenyang, Liaoning 110179, China
Abstract：In the 60Coγ primary standard laboratory at National Institute of Metrology(NIM), the primary standard values of the air keama and absorbed dose to water of 60Coγ radiation were disseminated to the FC65-G-2869 chamber from International Atomic Energy Agency(IAEA), and then the calibration factors were obtained.The calibration factors of the two physical quantities given by NIM were compared with the original calibration factors from IAEA.For the NIM calibration factors of the air kerma and absorbed dose to water of 60Coγ radiation to the IAEA FC65-G-2869 chamber, the discrepancies are 0.5% and 0.1% respectively, relative to the corresponding IAEA results.The comparison results are considered to be acceptable.This work is the preliminary preparation for NIM to participate in the ongoing Bureau International des Poids et Mesures(BIPM) key comparisons for the air kerma and absorbed dose to water of 60Coγ radiation.
金孙均,王志鹏,王坤,杨小元,黄锦锋,范耀东,苌雪,张健. 60Co γ辐射的空气比释动能及水吸收剂量的NIM-IAEA双边比对[J]. 计量学报, 2016, 37(4): 441-443.
JIN Sun-jun,WANG Zhi-peng,WANG Kun,YANG Xiao-yuan,HUANG Jin-feng, FAN Yao-dong,CHANG Xue,ZHANG Jian. The NIM-IAEA Bilateral Comparison on the Air Kerma and Absorbed Dose to Water of 60Co γ Radiation. Acta Metrologica Sinica, 2016, 37(4): 441-443.
［1］IAEA. Absorbed Dose Determination in High Energy Electron and Photon Beams［R］.IAEA Technical Report Series No277,1987.
［2］IAEA. Absorbed Dose Determination in External Beam Radiotherapy［R］.IAEA Technical Reports Series No398,2000.
［3］王坤,张辉,杨小元,等.60Co γ射线空气比释动能量值国内比对［J］.计量学报,2011,32（4）:377-380.
［4］Ratel G, Michotte C. BIPM comparison BIPM.RI(II)-K1 60Co of the activity measurements of the radionuclide 60Co［J］.Metrologia,2003,40(1A):06007.
［5］Allisy-roberts P J, Burns D T. Summary of the BIPM.RI(I)-K4 comparison for absorbed dose to water in 60Co gamma radiation［J］.Metrologia,2005,42(1A):06002.
［6］The BIPM key comparison database ［DB］.http://kcdb.bipm.org, 2015-11-01.
［7］李涛,王坤, 杨小元,等.基于石墨圆饼电离室的60Co γ射线空气比释动能的绝对测量研究［J］.原子能科学技术,2015,49(7): 1153-1158.
［8］王坤, 李涛, 杨小元.60Co γ水吸收剂量的量值复现和国际比对验证［J］.中国医学物理杂志,2013,30(6): 4476-4479.
［9］IAEA. IAEA/WHO network of secondary standard dosimetry laboratories comparison of therapy-level ionization chamber calibration coefficients［R］.CMP-CPR/2014/01,2014.
2016, Vol. 37 
