title: Beam range estimation by measuring bremsstrahlung.
abstract: We describe a new method for estimating the beam range in heavy-ion radiation therapy by measuring the ion beam bremsstrahlung. We experimentally confirm that the secondary electron bremsstrahlung process provides the dominant bremsstrahlung contribution. A Monte Carlo simulation shows that the number of background photons from annihilation gamma rays is about 1% of the bremsstrahlung strength in the low-energy region used in our estimation (63-68 keV). Agreement between the experimental results and the theoretical prediction for the characteristic shape of the bremsstrahlung spectrum validates the effectiveness of our new method in estimating the ion beam range.
authors.affiliation: Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency-JAEA, 1233 Watanuki-machi, Takasaki, Gunma 370-1292, Japan. yamaguchi.mitsutaka@jaea.go.jp
authors.forename: Mitsutaka
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: Kota
authors.initials: K
authors.lastname: Torikai
authors.forename: Naoki
authors.initials: N
authors.lastname: Kawachi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Shimada
authors.forename: Takahiro
authors.initials: T
authors.lastname: Satoh
authors.forename: Yuto
authors.initials: Y
authors.lastname: Nagao
authors.forename: Shu
authors.initials: S
authors.lastname: Fujimaki
authors.forename: Motohide
authors.initials: M
authors.lastname: Kokubun
authors.forename: Shin
authors.initials: S
authors.lastname: Watanabe
authors.forename: Tadayuki
authors.initials: T
authors.lastname: Takahashi
authors.forename: Kazuo
authors.initials: K
authors.lastname: Arakawa
authors.forename: Tomihiro
authors.initials: T
authors.lastname: Kamiya
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakano
mesh_terms: D005720:Gamma Rays / Q000627:therapeutic use; D009010:Monte Carlo Method; D017785:Photons / Q000627:therapeutic use; D011874:Radiometry / Q000379:methods*