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KMID : 1038720140250030123
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Progress in Medical Physics
2014 Volume.25 No. 3 p.123 ~ p.127
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Determination of TRS-398 Quality Factors for Cs-137 Gamma Rays in Reference Dosimetry
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Kang Sang-Koo
Rhee Dong-Joo
Kang Yeong-Rok
Kim Jeung-Kee
Jeong Dong-Hyeok
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Abstract
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The Cs-137 irradiator is widely used to irradiate biological samples for radiobiological research. To obtain the accurate outcomes, correct measurements of the delivered absorbed dose to a sample is important. The IAEA protocols such as TRS-277 and TRS-398 were recommended for the Cs-137 reference dosimetry. However in TRS-398 protocol, currently known as the most practical dosimetry protocol, the quality factor (kQ,Q0 ) for Cs-137 gamma rays is not suggested. Therefore, the use of TRS-398 protocol is currently unavailable for the Cs-137 dosimetry directly. The calculation method previously introduced for high energy photon beams in radiotherapy was used for deriving the Cs-137 beam qualities (kQ,Q0) for the 15 commercially available farmer type ionization chambers in this study. In conclusion, kQ,Q0 values were ranged from 0.998 to 1.002 for Cs-137 gamma rays. These results can be used as the reference and dosimeter calibrations for Cs-137 gamma rays in the future radiobiological researches.
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KEYWORD
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Cs-137 gamma rays, TRS-398 protocol, Quality factor
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