Study of X-Rays Generated by Target in CT

LI Quan-Feng; CHENG Cheng; YAN Hui-Yong; DU Tai-Bin; CHEN Huai-Bi

Chinese Physics C> 2006, Vol. 30> Issue(10) : 1032-1035

Study of X-Rays Generated by Target in CT

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

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Abstract：
The X-rays generated and transported in target bombarded by electron beams in CT have been simulated with Monte Carlo code MCNP4. Photon efficiencies and forward directional characteristics of X-rays for several kinds of often-used targets were calculated and analyzed. Calculations show that as the thickness of the target increases, the photon efficiency increases and reaches a maximum, and then drops sharply for gold and tungsten target, while drops gently for cooper target. Also, the photon efficiency for cooper target is relatively small, but the angular distribution shows good forward directional characteristics, with the dose rate in the forward direction equivalent to those of tungsten or gold target. Experiment results show that the dose rate in the forward direction of a copper target is higher than that of a tungsten target for 20MeV electrons, while the angular distribution presents better forward directional characteristics compared with a tungsten target.

References

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. Swanson W P. Radiological Safety Aspects of the Opera-tion of Electron Linear Accelerators, Technical Report Se-ries No. 188. Vienna: International Atomic Energy Agency,19792. Bresmeister J F. MCNP-A general Monte Carlo N-Particle Transport Code, Version 4B, Report No. LA-12625-M. Los Alamos (USA): Los Alamos National Laboratory, 19973. Nordell B, Brahme A. Phys. Med. Biol., 1984, 29(7): 797-8104. GUO Bing-Qi, LI Quan-Feng, DU Tai-Bin et al. HEP NP, 2005, 29(12): 1190-1195(in Chinese)(郭冰琪, 李泉风, 杜泰斌等.高能物理与核物理, 2005, 29(12): 1190-1195)5. Jallu F, Lyoussi A, Payan E et al. Nuclear Instruments andMethods in Physics Research, 1999, B155(4): 373-381

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LI Quan-Feng, CHENG Cheng, YAN Hui-Yong, DU Tai-Bin and CHEN Huai-Bi. Study of X-Rays Generated by Target in CT[J]. Chinese Physics C, 2006, 30(10): 1032-1035.

LI Quan-Feng, CHENG Cheng, YAN Hui-Yong, DU Tai-Bin and CHEN Huai-Bi. Study of X-Rays Generated by Target in CT[J]. Chinese Physics C, 2006, 30(10): 1032-1035. shu

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Received: 2006-01-07
Revised: 2006-04-10

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of X-Rays Generated by Target in CT

Corresponding author: LI Quan-Feng,

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Received Date: 2006-01-07

Accepted Date: 2006-04-10

Available Online: 2006-10-05

Abstract: The X-rays generated and transported in target bombarded by electron beams in CT have been simulated with Monte Carlo code MCNP4. Photon efficiencies and forward directional characteristics of X-rays for several kinds of often-used targets were calculated and analyzed. Calculations show that as the thickness of the target increases, the photon efficiency increases and reaches a maximum, and then drops sharply for gold and tungsten target, while drops gently for cooper target. Also, the photon efficiency for cooper target is relatively small, but the angular distribution shows good forward directional characteristics, with the dose rate in the forward direction equivalent to those of tungsten or gold target. Experiment results show that the dose rate in the forward direction of a copper target is higher than that of a tungsten target for 20MeV electrons, while the angular distribution presents better forward directional characteristics compared with a tungsten target.

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Study of X-Rays Generated by Target in CT

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