Response of a plate-type thermoluminescence dosimeter to a therapeutic carbon beam

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• 作者：Yusuke Koba (1)
  Shigekazu Fukuda (1)
  Kiyomitsu Shinsho (2)
  Genichiro Wakabayashi (3)
  Satoshi Tamatsu (4)
  
• 关键词：Plate ; type thermoluminescence dosimeter ; Therapeutic carbon beam ; LET dependence
• 刊名：Journal of the Korean Physical Society
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：63
• 期：7
• 页码：1432-1436
• 全文大小：
• 作者单位：Yusuke Koba (1)
  Shigekazu Fukuda (1)
  Kiyomitsu Shinsho (2)
  Genichiro Wakabayashi (3)
  Satoshi Tamatsu (4)
  
  1. National Institute of Radiological Sciences, Chiba, 263-8555, Japan
  2. Tokyo Metropolitan University, Tokyo, 116-8551, Japan
  3. Kinki University Atomic Energy Research Institute, Osaka, 577-8502, Japan
  4. Chiba University, Chiba, 263-8522, Japan
  
• ISSN：1976-8524

文摘

In order to measure the three-dimensional dose distribution in X-ray radiotherapy, we developed a plate-type thermoluminescence dosimeter (TLD) using the TL phosphor Li3B7O12:Cu, which has Z eff = 7.42 and a density of 1.01 gcm?3. This detector was expected on useful application in advanced X-ray radiotherapies such as intensity-modulated ratiation therapy (IMRT) etc., because it can obtain 3D dose measurements simply and quickly with a single exposure. In this paper, we report the response of this plate-type TLD to a therapeutic carbon beam at the Heavy Ion Medical Accelerator in Chiba (HIMAC). Using a plate heater and charge coupled device (CCD) camera, we captured 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 the ionization chamber. The relative TL efficiency of this TLD as 60Co gamma-ray equivalent decreased gradually with increasing dose-averaged linear-energy-transfer (LET), reaching about 20% at the Bragg peak of 290 MeV/u carbon ions.