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

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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. © 2013 Kim et al.; licensee BioMed Central Ltd.

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Kim, D. W., Chung, W. K., Shin, J., Lim, Y. K., Shin, D., Lee, S. B., … Cho, J. K. (2013). Secondary neutron dose measurement for proton eye treatment using an eye snout with a borated neutron absorber. Radiation Oncology, 8(1). https://doi.org/10.1186/1748-717X-8-182

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