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KMID : 0357520160390040643
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Journal of Radiological Science and Technology
2016 Volume.39 No. 4 p.643 ~ p.649
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Evaluation of Residual Radioactivity and Dose Rate of a Target Assembly in an IBA Cyclotron
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Hwang Seon-Yong
Kim Young-Ju
Lee Seung-Wook
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Abstract
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When a cyclotron produces 18F-, accelerated protons interact with metal parts of the cyclotron machine and induces radioactivity. Especially, the target window and chamber of the target assembly are the main parts where long-lived radionuclides are generated as they are incident by direct beams. It is of great importance to identify radionuclides induced in the target assembly for the safe operation and maintenance of a cyclotron facility. In this study, we analyzed major radionuclides generated in the target assembly by an operation of the Cyclotron 18/9 machine and measured dose rates after the operation to establish the radiation safety guideline for operators and maintenance personnel of the machine. Gamma spectroscopy with HPGe was performed on samples from the target chamber and Havar foil target window to identify the radionuclides generated during the operation for production of 18F- - isotope and their specific activity. Also, the dose rates from the target were measured as a function of time after an operation. These data will help improve radiological safety of operating the cyclotron facilities.
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KEYWORD
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Cyclotron , Target assembly , Activiation , Havar foil , Gamma sepctroscopy
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