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 language | English |
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Article number | 182 |
Journal | Radiation Oncology |
Volume | 8 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2013 Jul 17 |
Bibliographical note
Funding Information:This work was supported by a research grant from the National Cancer Center, Korea (no. 1110600) and General Researcher Program (2012003174) through the National Research Foundation.
Keywords
- Boron
- CR-39
- Eye
- Neutron
- Proton
- Secondary
ASJC Scopus subject areas
- Oncology
- Radiology Nuclear Medicine and imaging