Thermoluminescent responses of Li3B7O12:Cu to proton beam.
A thermoluminescent (TL) phosphor Li3B7O12:Cu was irradiated by a proton beam at NIRS-HIMAC in Japan. Irradiation was performed at different water-equivalent depths using range shifters made of polymethyl methacrylate. The thermoluminescent responses of Li3B7O12:Cu were analysed, focusing on the TL efficiency and glow curve. The irradiated samples were heated from room temperature to 200°C at 0.16°C s(-1). The high-temperature area of the glow curve under proton irradiation changed in comparison with that under (60)Co gamma-ray irradiation. The relative TL efficiency of the main peak slightly varied between 0.8 and 1.1. The relationship between the relative TL efficiency of the main peak and the high-temperature area ratio (HTR) value, the relative TL ratio of the main peak to the high-temperature area, showed approximate linearity for proton dosimetry. Using correction based on the HTR method, the TL phosphor Li3B7O12:Cu can become a useful dosimetric tool for therapeutic proton beams.
National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba 263-8555, Japan y-koba@nirs.go.jp.
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Koba
Tokyo Metropolitan University, 7-2-10 Higashi-Ogu, Arakawa-ku, Tokyo 116-8551, Japan.
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Shinsho
Chiba University, 1-33 Yayoicho, Inage-ku, Chiba 263-8522, Japan.
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Tamatsu
National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba 263-8555, Japan.
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Fukuda
Kinki University Atomic Energy Research Institute, 3-4-1 Kowakae, Higashiosaka-shi, Osaka 577-8502, Japan.
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Wakabayashi
D003037:Cobalt Radioisotopes; D003300:Copper / Q000737:chemistry*; D005720:Gamma Rays; D006358:Hot Temperature; D006801:Humans; D018020:Lithium Compounds / Q000737:chemistry*; D019047:Phantoms, Imaging; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011522:Protons; D011874:Radiometry; D012542:Scattering, Radiation; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*; D014867:Water
D003037:Cobalt Radioisotopes; D018020:Lithium Compounds; D011522:Protons; D014867:Water; D003300:Copper; D019904:Polymethyl Methacrylate