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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 (   ) 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 (   ) for the 15 commercially available farmer type ionization chambers in this study. In conclusion,    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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