GZP型<sup>60</sup>Co近距离治疗源基于金属施源器剂量参数的蒙特卡罗研究

doi:10.3760/cma.j.issn.1004-4221.2018.06.014

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Abstract Objective To evaluate the effect of stainless steel applicator on dose distribution in GZP ⁶⁰Co brachytherapy source and to obtain the dosimetric parameters of the ⁶⁰Co source with stainless steel applicator. Methods Geant4 was employed to obtain the mean adsorption dose of the ⁶⁰Co brachytherapy source in the range of 0-10 cm, and the dosimetric parameters were calculated according to the formula proposed by AAPM reports TG43 and TG43U1. The ⁶⁰Co source was located in the center of a sphere water phantom with a radius of 30 cm. Results For channel 1 and 2 of GZP ⁶⁰Co source, the results of Λ with stainless steel applicator were 1.014 cGyh^-1U^-1(with a difference of 0.5% compared with non-applicator), the results of Λ with stainless steel applicator for channel 3 were 0.998 cGyh^-1U^-1(with a difference of 0.1% compared with non-applicator). The radial dose function in the range of 0.5-10.0 cm in a longitudinal direction was calculated and the fitting formula for the function was obtained. The polynomial function for the radial dose function and the anisotropy function with a of 0°-175° and an r of 0.5-10.0 cm were obtained. Conclusion The dosimetric parameters of the ⁶⁰Co source with stainless steel applicator are obtained, which provide more accurate reference data for clinical application. In clinical practice, the effect of stainless steel applicator on dose distribution should be considered.

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	Articles by authors
	Wu Junxiang
	Wang Xianliang
	Kang Shengwei
	Li Jie
	Lei Qin
	Chen Zhao
	Wang Pei

Key words： ⁶⁰Co brachytherapy source Stainless steel applicator Dosimetric parameter

Received: 20 March 2017

Corresponding Authors: Wang Pei, Email:dengwangpei@163.com

Cite this article:

Wu Junxiang,Wang Xianliang,Kang Shengwei et al. Monte Carlo dosimetric study of the GZP ⁶⁰Co brachytherapy source with stainless steel applicator[J]. Chinese Journal of Radiation Oncology, 2018, 27(6): 601-606.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2018.06.014 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2018/V27/I6/601

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