Presentation Thermal luminescence efficiency of Al2O3:Cr ceramic to heavy charged particle

Chang, Weishan  ,  Koba, Yusuke  ,  Shimomura, Risa  ,  Shinsho, Kiyomitsu  ,  Matsumoto, Kazuki  ,  Ushiba, Hiroki  ,  Ando, Takayuki

Introduction: Recent research has shown alumina-based ceramics TLD (A8, Chibacera Mfg. Co.) is easy to handle and owns a less LET-dependent glow peak which is potential for measurement in heavy charged particle (HCP) therapy beam. However, the sensitivity of is not stable enough for implantation in radiotherapy field. Therefore, a TLD made by chromium-doped alumina (A10, Chibacera Mfg. Co.) was developed to improve the sensitivity.Purpose: This study aims to provide basic dosimetric properties of A10. Material and methods: To obtain the thermal luminescence (TL) efficiency, A10 were irradiated using a 160 MeV/u proton beam, a 150 MeV helium beam, a 290 MeV/u carbon beam, a 400 MeV/u Neon beam and a 500 MeV/u Argon beam. TL efficiency was normalized by a 6MV X-ray. A10 was heated to 400 oC at a heating rate of 0.2 degree per second and the glow curves were read by an in-house developed readout system. To improve the accuracy, the timeline of the readout procedure was consistent for each experiment in the present study.Results: The dose to response curve of A10 was linear in the range of 0.5-5 Gy for each beam but the slope was different to each other. The TL efficiency of A10 increased from 0.84 to 1.18 at LET range from 0.5 keV/μm to 13.2 keV/μm and decreased to 0.6 when keV/μm was 197 keV/μm.
World Congress on Medical Physics & Biomedical Engineering

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