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Construction of High Dose Rate 192Ir γ-rays Reference Radiation Field |
ZHI Shi-jie1,WANG Ji2,WANG Pei-wei2,WU Jin-jie2,REN Shi-wei3 |
1. Department of Radiation Oncology, North China University of Science and Technology Affiliated Hospital,Tangshan, Hebei 063000, China
2. National Institute of Metrology, Beijing 100029, China
3. School of Science, Hebei University of Science and Technology, Shijiazhuang,Hebei 050018, China |
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Abstract To complete the absolute measurement of the reference air kerma rate of the high dose rate 192Ir radioactive source, a special irradiator and positioning device was designed, and a collimated reference radiation field was built using a medical high dose rate brachytherapy machine. Concerning relevant standards such as ISO 4037, the scattering, radiation field, half-value layer, effective energy and other related parameters of the reference radiation field were measured. The results show that the ambient scattering share is less than 0.003% of the main beam at multiple locations in the radiation field; at a distance of 1.4 m from the radiation source, the diameter of the radiation field is 98 mm, which is larger than the benchmark graphite cavity ionization chamber; the layer measurement result is Cu of 8.224mm,and the effective energy is 402.8keV. The 192Ir energy spectrum measured by HPGe detector is in good agreement with the simulated spectrum. All the parameters met the requirement of the 192Ir brachytherapy source reference air kerma rate to reproduce the magnitude, which laid the foundation for its absolute measurement and international comparison.
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Received: 20 December 2022
Published: 27 December 2023
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[7] |
候金鹏, 邓大平, 朱建国. “体外射束放射治疗中患者的放射卫生防护标准”和“后装γ源近距离治疗放射卫生防护标准”简介 [J]. 中国肿瘤, 1996, 12: 8-9.
|
[8] |
Adrovic F. Air Kerma Rate Constants for Nuclides Important to Gamma Ray Dosimetry and Practical Application [M]. InTech, 2012.
|
|
Liu R F, Wang X H, Yang K H, et al. A systematic review of high-dose rate and low-dose rate brachytherapy for cervical cancer [J]. Oncology, 2008 (11): 980-985.
|
[10] |
BNM-CEA/LNHB (France),
|
[13] |
高飞, 郭文. Co-60光子参考辐射场的蒙特卡罗方法研究 [C]// 中国宇航学会年会.2009.
|
[9] |
成建波.137Cs γ辐照器辐射场特性研究[D].兰州:兰州大学, 2015.
|
[16] |
Borg J, Rogers D. Spectra and air-kerma strength for encapsulated 192Ir sources [J]. Medical Physics, 1999, 26 (11):2441-4.
|
[3] |
刘锐锋, 王小虎, 杨克虎, 等. 高剂量率与低剂量率近距离放射治疗宫颈癌的系统评价 [J]. 肿瘤, 2008 (11): 980-985.
|
|
PTB (Germany), INEEL (USA), KRI (Russia), LBNL (USA), NPL (United Kingdom), CIEMAT (Spain).Ir-192_tables[EB/OL].http://www.lnhb.fr/nuclides/Ir-192_tables.pdf.
|
[2] |
Hyer D E, Sheybani A, Jacobson G M, et al. The dosimetric impact of heterogeneity corrections in high-dose-rate Ir brachytherapy for cervical cancer: Investigation of both conventional Point-A and volume-optimized plans [J]. Brachytherapy, 2012, 11 (6): 515-520.
|
[12] |
成建波, 李德红, 姚泽恩, 等. (137)Cs γ辐照器光阑的优化设计 [J]. 核电子学与探测技术, 2015, 35 (3): 4.
|
[1] |
Kolff M W, Pieters B R,Mangoenkarso E Z, et al. Comparison between brachytherapy and external beam boost in breast conserving therapy [J]. European Journal of Cancer Supplements, 2008, 6 (7): 142-142.
|
[4] |
Stromberg J S, Martinez A A, Horwitz E M, et al. Conformal high dose rate Ir-192 boost brachytherapy in locally advanced prostate cancer: superior prostate specific antigen response compared to external beam treatment [J]. The cancer journal from entific American, 1997, 3 (6): 346-352.
|
[6] |
Alvarez J T, Sander T, Pooter J D, et al. Comparison BIPM.RI (I)-K8 of high dose rate 192 Ir brachytherapy standards for reference air kerma rate of the NPL and the BIPM [J]. Metrologia, 2014, 51 (1A): 06024-06024.
|
|
Hou J P, Deng D P, Zhu J G. Introduction to “Radiation Hygiene Protection Standards for Patients in External Beam Radiation Therapy” and “Radio Hygiene Protection Standards for Post-loaded γ-source Brachytherapy” [J]. China Oncology, 1996, 12 : 8-9.
|
[15] |
严永强, 孙圣涛, 吴金杰, 等. 宽能平面型HPGe探测器能量刻度及MC模拟 [J]. 计量学报, 2021, 42 (11):1511-1516.
|
[5] |
Kessler C, Kurosawa T, Mikamoto T. Comparison BIPM.RI (I)-K8 of high dose-rate Ir-192 brachytherapy standards for reference air kerma rate of the NMIJ and the BIPM [J]. Metrologia, 2016, 53 (1A): 06001.
|
[11] |
X-5 Monte Carlo Team. MCNP: A general Monte Carlo N-particle transport code: LA-UR-03-1987[R]. USA: LANL, 2003.
|
|
Cheng J B, Li D H, Yao Z E, et al. Optimal design of aperture for (137)Cs gamma irradiator [J]. Nuclear Electronics and Detection Technology, 2015, 35 (3): 4.
|
[14] |
Salvat F, Fernández-Varea, José M. Overview of physical interaction models for photon and electron transport used in Monte Carlo codes [J]. Workshop Proceedings, 2001, 46 (2): S112-S138.
|
|
Wu A L, Wu A D, Zhu L, et al. Monte Carlo simulation study of dosimetric parameters of Varian high dose rate iridium source [J]. Chinese Journal of Radiation Medicine and Protection, 2018, 38 (11): 6.
|
[18] |
李士骏. 电离辐射剂量学 [M]. 北京:原子能出版社, 1981。
|
[19] |
Bandalo V, Greiter M B, J Brnner, et al. ISO 4037: 2019 Validation of Radiation Qualities by Means of Half -Value Layer and HP (10) Dosimetry[J]. Radiation Protection Dosimetry, 2019.
|
[20] |
ISO 4037-1-2019 Radiological protection-X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy-Part 1: Radiation characteristics and production methods (Second Edition)[S].
|
|
Yan Y Q, Sun S T, Wu J J, et al. Energy scaling and MC simulation of wide-energy planar HPGe detectors [J]. Acta Mctroloyica Sinica, 2021, 42 (11): 1511-1516.
|
[17] |
吴爱林, 吴爱东, 朱磊, 等. 瓦里安高剂量率铱源剂量学参数的蒙特卡罗模拟研究 [J]. 中华放射医学与防护杂志, 2018, 38 (11): 6.
|
|
|
|