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Response of a Plate-type Thermoluminescence Dosimeter to a Therapeutic Carbon Beam
Yusuke Koba,Shigekazu Fukuda,Kiyomitsu Shinsho,Genichiro Wakabayashi,Satoshi Tamatsu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
In order to measure the three-dimensional dose distribution in X-ray radiotherapy, we developeda plate-type thermoluminescence dosimeter (TLD) using the TL phosphor Li3B7O12:Cu, which hasZeff = 7.42 and a density of 1.01 gcm−3. This detector was expected on useful application inadvanced X-ray radiotherapies such as intensity-modulated ratiation therapy (IMRT) etc., becauseit can obtain 3D dose measurements simply and quickly with a single exposure. In this paper, wereport the response of this plate-type TLD to a therapeutic carbon beam at the Heavy Ion MedicalAccelerator in Chiba (HIMAC). Using a plate heater and charge coupled device (CCD) camera, wecaptured thermoluminescence images of plate-type TLDs irradiated by a therapeutic carbon beam. The TL intensity was measured at each water equivalent depth and compared with output of theionization chamber. The relative TL efficiency of this TLD as 60Co gamma-ray equivalent decreasedgradually with increasing dose-averaged linear-energy-transfer (LET), reaching about 20% at theBragg peak of 290 MeV/u carbon ions.