Published: October 18, 2017
Particle Dependence of Quenching Effect in an Optical-Fiber-Type Optically Stimulated Luminescence Dosimeter [PDF]
Yuho Hirata, Kenichi Watanabe, Sachiko Yoshihashi, Akira Uritani, Yusuke Koba, Naruhiro Matsufuji, Takayuki Yanagida, Toshiyuki Toshito, and Kentaro Fukuda
(Received April 7, 2017; Accepted August 21, 2017)
Keywords: dosimeter, heavy ion radiotherapy, optically stimulated luminescence, optical fiber probe, quenching phenomena
To monitor an actual dose in a patient’s body during radiotherapy treatment, we have developed a small-size dosimeter of an optical fiber probe mounting optically stimulated luminescence (OSL) materials at the tip. The OSL materials show a quenching effect when they are irradiated by charged particles with high linear energy transfer (LET). We evaluate the particle dependence on the quenching effect in the small-size OSL dosimeter probe. Eu:BaFBr and Ce:CaF2 were adopted as OSL materials, and two types of small-size dosimeter were fabricated. We irradiated 290 MeV/u carbon ions, 150 MeV/u helium ions, and 225 MeV protons and measured the Bragg peak. The Eu:BaFBr small-size dosimeter showed the quenching effect in these three types of particle irradiation. The Ce:CaF2 small-size dosimeter showed the quenching effect only in carbon ion irradiation. The luminescence efficiencies of Eu:BaFBr were compared among these three charged particles. The quenching effect of Eu:BaFBr is independent of the irradiated particles.
Corresponding author: Yuho Hirata
Cite this article
Yuho Hirata, Kenichi Watanabe, Sachiko Yoshihashi, Akira Uritani, Yusuke Koba, Naruhiro Matsufuji, Takayuki Yanagida, Toshiyuki Toshito, and Kentaro Fukuda, Particle Dependence of Quenching Effect in an Optical-Fiber-Type Optically Stimulated Luminescence Dosimeter, Sens. Mater., Vol. 29, No. 10, 2017, p. 1455-1464.