Brachytherapy dosimetry of 125I and 103Pd sources using an updated cross section library for the MCNP Monte Carlo transport code.
Brachytherapy dosimetry of 125I and 103Pd sources using an updated cross section library for the MCNP Monte Carlo transport code.
复制标题
使用 MCNP 蒙特卡罗传输代码的更新横截面库对 125I 和 103Pd 源进行近距离放射治疗剂量测定。
DOI:
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发表时间:
2003
期刊:
影响因子:
--
通讯作者:
L. Dewerd
中科院分区:
文献类型:
--
作者:
T. Bohm;P. Deluca;L. Dewerd
Permanent implantation of low energy (20-40 keV) photon emitting radioactive seeds to treat prostate cancer is an important treatment option for patients. In order to produce accurate implant brachytherapy treatment plans, the dosimetry of a single source must be well characterized. Monte Carlo based transport calculations can be used for source characterization, but must have up to date cross section libraries to produce accurate dosimetry results. This work benchmarks the MCNP code and its photon cross section library for low energy photon brachytherapy applications. In particular, we calculate the emitted photon spectrum, air kerma, depth dose in water, and radial dose function for both 125I and 103Pd based seeds and compare to other published results. Our results show that MCNP's cross section library differs from recent data primarily in the photoelectric cross section for low energies and low atomic number materials. In water, differences as large as 10% in the photoelectric cross section and 6% in the total cross section occur at 125I and 103Pd photon energies. This leads to differences in the dose rate constant of 3% and 5%, and differences as large as 18% and 20% in the radial dose function for the 125I and 103Pd based seeds, respectively. Using a partially updated photon library, calculations of the dose rate constant and radial dose function agree with other published results. Further, the use of the updated photon library allows us to verify air kerma and depth dose in water calculations performed using MCNP's perturbation feature to simulate updated cross sections. We conclude that in order to most effectively use MCNP for low energy photon brachytherapy applications, we must update its cross section library. Following this update, the MCNP code system will be a very effective tool for low energy photon brachytherapy dosimetry applications.
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影响因子:
3.8
作者:
Patel,NS;Chiu-Tsao,ST;Williamson,JF;Fan,P;Duckworth,T;Shasha,D;Harrison,LB
通讯作者:
Harrison,LB
影响因子:
3.8
作者:
Williamson,JF
通讯作者:
Williamson,JF
影响因子:
3.8
作者:
Chibani,Omar;Li,XAllen
通讯作者:
Li,XAllen
DOI:
10.1016/0360-3016(83)90429-7
发表时间:
1983
期刊:
International journal of radiation oncology, biology, physics
影响因子:
--
作者:
Ling,CC;Yorke,ED;Spiro,IJ;Kubiatowicz,D;Bennett,D
通讯作者:
Bennett,D