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J Korean Soc Ther Radiol Oncol > Volume 17(3); 1999 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 1999;17(3): 256-260.
Photon Energy Dependence of the Sensitivity of LiF TLDs Loaded with Thin Material
Byongim J Min, Sookil Kim, John J K Loh, Young Kap Cho
1Department of Radiation Oncology, Inha University Hospital, Incheon, Korea.
2Department of Premedical Sciences, Kosin Medical College, Pusan, Korea.
ABSTRACT
PURPOSE:
An investigation has been carried out on the factors which affect the response reading of thermoluminescent dosimeters (TLD-100) loaded with thin material in high energy photon. The aim of the study was to assess the energy response of TLD-100 to the therapeutic ranges of photon beam.
MATERIALS AND METHODS:
In this technique, TLD-100 (abbreviated as TLD) chips and three different thin material (Tin, Gold, and Tissue equivalent plastic plate) which mounted on the TLD chip were used in the clinical photon beam. The thickness of each metal plates was 0.1 mm and TE plastic plate was 1 mm thick. These compared with the photon energy dependence of the sensitivities of TLD (normal chip), TLD loaded with Tin or Gold plate, for the photon energy range 6 MV to 15 MV, which was of interest in radiotherapy.
RESULTS:
The enhancement of surface dose in the TLD with metal plate was clearly detected. The TLD chips with a Gold plate was found to larger response by a factor of 1.83 in 10 MV photon beam with respect to normal chip. The sensitivity of TLD loaded with Tin was less than that for normal TLD and TLD loaded with Gold. The relative sensitivity of TLD loaded with metal has little energy dependence.
CONCLUSION:
The good stability and linearity with respect to monitor units of TLD loaded with metal were demonstrated by relative measurements in high energy photon (6~15 MV) beams. The TLD laminated with metals embedded system in solid water phantom is a suitable detector for relative dose measurements in a small beam size and surface dose.
Key Words: TLD, Relative sensitivity, Energy dependence
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