Research on Monte Carlo calculation method for photon absorbed dose

Xie Rong; Hao Jianhong; Zhao Qiang; Zhang Fang; Fan Jieqing; Xue Bixi; Dong Zhiwei; Cao Xiangchun

doi:10.11884/HPLPB202436.240037

Volume 36 Issue 10

Oct. 2024

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Article Navigation > High Power Laser and Particle Beams > 2024 > 36(10): 106003

Xie Rong, Hao Jianhong, Zhao Qiang, et al. Research on Monte Carlo calculation method for photon absorbed dose[J]. High Power Laser and Particle Beams, 2024, 36: 106003. doi: 10.11884/HPLPB202436.240037

Citation:

Xie Rong, Hao Jianhong, Zhao Qiang, et al. Research on Monte Carlo calculation method for photon absorbed dose[J]. High Power Laser and Particle Beams, 2024, 36: 106003. doi: 10.11884/HPLPB202436.240037

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Research on Monte Carlo calculation method for photon absorbed dose

doi: 10.11884/HPLPB202436.240037

1.
School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

Received Date: 2024-05-25
Accepted Date: 2024-08-25
Rev Recd Date: 2024-08-25

Available Online: 2024-09-03

Publish Date: 2024-10-15

Abstract

Abstract

To accurately and effectively calculate and evaluate photon doses under different radiation conditions by selecting appropriate calculation methods, this paper compares and studies four commonly used photon dose calculation methods in Monte Carlo simulation software: dose conversion coefficient method, heat number method, track length energy deposition method and pulse height method. Starting from the calculation principle and combining simulation results, these four methods are analyzed and compared. By simulating single energy photon beams with different energies incident on water spheres of different volume sizes, the error caused by approximating absorbed dose with kerma was analyzed, and the influence of different contents of high atomic number element gadolinium on absorbed dose calculation results was simulated and analyzed. Due to the fact that the conversion coefficient is calculated based on the reference human model, the dose conversion coefficient method can only quickly estimate and calculate the absorbed dose, it is difficult to obtain accurate dose in specific situations. When high-energy photons are incident on a small volume of material, kerma will be greater than the absorbed dose, thus the heat number method and the track length energy deposition method will produce errors, and the pulse height counting method is more suitable. At low energy and large volume, any method can be selected based on computational accuracy and computer resources. When the content of high atomic number elements in a substance increases, the calculation error between the track length energy deposition method and the pulse height method will decrease.
- photons,
- absorbed dose,
- Monte Carlo method,
- human phantom simulation

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References(20)

References

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