高エネルギーX線治療におけるCR-39を用いた中性子測定システム

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タイトル別名
  • A Neutron Dosimetry System Using CR-39 for High-energy X-ray Radiation Therapy
  • コウエネルギー Xセン チリョウ ニ オケル CR-39 オ モチイタ チュウセイシ ソクテイ システム

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抄録

Neutrons are produced during radiation treatment by megavolt X-ray energies. However, it is difficult to measure neutron dose especially just during the irradiation. Therefore, we have developed a system for measuring neutrons with the solid state track detector CR-39, which is free from the influence of the X-ray beams. The energy spectrum of the neutrons was estimated by a Monte Carlo simulation method, and the estimated neutron dose was corrected by the contribution ratio of each energy.<br>Pit formation rates of CR-39 ranged from 2.3×10-3 to 8.2×10-3 for each detector studied. According to the estimated neutron energy spectrum, the energy values for calibration were 144 keV and 515keV, and the contribution ratios were approximately 40:60 for 10 MV photons and 20:70 for photons over 15 MV. Neutron doses measured in the center of a high-energy X-ray field were 0.045 mSv/Gy for a 10 MV linear accelerator and 0.85 mSv/Gy for a 20 MV linear accelerator.<br>We successfully developed the new neutron dose measurement system using the solid track detector, CR-39. This on-time neutron measurement system allows users to measure neutron doses produced in the radiation treatment room more easily.

収録刊行物

  • 医学物理

    医学物理 34 (3), 139-148, 2014

    公益社団法人　 日本医学物理学会

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