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Comparison and Analysis of the Dose Conversion Coefficients of External Photon Irradiation |
CHEN Chong1, XIN Rui2, YANG Xiang-shan1, HE Qiang1, FENG Wei1, CHEN Da-wei1 |
1. School of Public Health, Jilin University, Changchun 130021 China; 2. The Secend Hospital of Jilin University |
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Abstract Objective To explore and analyze the limitations of the dose conversion coefficients of the current national standard GBZ/T144-2002 external photon irradiation, in order to provide some reference for its update.Methods Compare the dose conversion coefficients of the national standard GBZ/T144-2002 with the International Commission on Radiological Protection (ICRP) 116 and analyze the differences.Results The overall change trends of the two dose conversion coefficients are consistent, however, the left lateral geometry of the liver radiation, dose conversion coefficients of the ICRP 116 for females and males are higher than GBZ/T144, when the energy is less than 150 keV, the relative changes can be more than 30%; in addition to the right lateral geometry, dose conversion coefficients of the ICRP 116 for females are higher than males; the energy from 30 keV to 200 keV, the relative changes of the left lateral geometry in radiation are more than 30%, the lower the energy, the greater the difference, the largest is more than 100%. The antero-posterior geometry radiation of the female breasts, the energy higher than 4 MeV, the relative changes are more than 50%.Conclusion Under different radiation conditions, the national standard is consistent with the results of ICRP 116, but when considering the type of reference phantom and reference persons' parameters, gender, secondary electron, incident photon energy and so on, the difference is obvious and the dose conversion coefficients of the GBZ/T144 need to make some adjustments.
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Received: 25 November 2016
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[1] International Commission on Radiological Protection. Conversion coefficients for use in radiological protection against external radiation[R].ICRP Publication 74, Oxford:Pergamon Press, 1997. [2] International Commission on Radiological Protection. Conversion coefficients for radiological protection quantities for external radiation[R].ICRP Publication 116, Oxford:Pergamon Press, 2010. [3] 中华人民共和国卫生部. GBZ/T 144-2002用于光子外照射放射防护的剂量转换系数[S].北京:中国标准出版社,2002. [4] 梁潇,刘春雨,董良,等.中国女性参考人曲面模型的光子有效剂量转换系数计算[J].原子能科学技术,2014,48(S1):780-785. [5] 刘倩倩,刘海宽,陈波,等.Voxel体素模型在辐射防护的应用和进展[J].中国医学物理学杂志,2015, 32(5):629-634. [6] 闫聪冲,邱睿,刘立业,等.中国参考人数字体素体模及其在辐射防护领域的应用[J].清华大学学报自然科学版,2012,52(7):911-916. [7] Junli Li, Rui Qiu, Zhan Zhang, et al. Organ dose conversion coefficients for external photon irradiation using the Chinese Voxel Phantom (CVP)[J]. Radiation Protection Dosimetry, 2009, 135(1):33-42. |
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