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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

  • 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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    [1] . 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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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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