Secondary neutron dose measurement for proton eye treatment using an eye snout with a borated neutron absorber

Dong Wook Kim, Weon Kuu Chung, Jungwook Shin, Young Kyung Lim, Dongho Shin, Se Byeong Lee, Myongguen Yoon, Sung Yong Park, Dong Oh Shin, Jung Keun Cho

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Background: We measured and assessed ways to reduce the secondary neutron dose from a system for proton eye treatment.Methods: Proton beams of 60.30 MeV were delivered through an eye-treatment snout in passive scattering mode. Allyl diglycol carbonate (CR-39) etch detectors were used to measure the neutron dose in the external field at 0.00, 1.64, and 6.00 cm depths in a water phantom. Secondary neutron doses were measured and compared between those with and without a high-hydrogen-boron-containing block. In addition, the neutron energy and vertices distribution were obtained by using a Geant4 Monte Carlo simulation.Results: The ratio of the maximum neutron dose equivalent to the proton absorbed dose (H(10)/D) at 2.00 cm from the beam field edge was 8.79 ± 1.28 mSv/Gy. The ratio of the neutron dose equivalent to the proton absorbed dose with and without a high hydrogen-boron containing block was 0.63 ± 0.06 to 1.15 ± 0.13 mSv/Gy at 2.00 cm from the edge of the field at depths of 0.00, 1.64, and 6.00 cm.Conclusions: We found that the out-of-field secondary neutron dose in proton eye treatment with an eye snout is relatively small, and it can be further reduced by installing a borated neutron absorbing material.

Original languageEnglish
Article number182
JournalRadiation Oncology
Volume8
Issue number1
DOIs
Publication statusPublished - 2013 Jul 17

Keywords

  • Boron
  • CR-39
  • Eye
  • Neutron
  • Proton
  • Secondary

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

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