Measurement of Thermal Neutron Distribution from a Medical Cyclotron Using Auto Radiography with <SUP>23</SUP>Na Activation Detector and Medical Imaging Plate
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概要
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When the generated activity of 18F was 100 GBq, about 1015 neutrons are emitted by the nuclear reaction in target of the medical cyclotron. These neutrons induce activity in the cyclotron and the indoor concrete of the cyclotron room, and will contribute to the exposure of the staff maintaining the cyclotron.<BR>This paper describes the basic characteristics of the thermal neutron measurement method of 23Na activation detector by auto radiography (ARG) using the medical imaging plate (IP).<BR>Simple linear regression lines were able to describe the relationship between the scanner unit and the activity of <SUP>23</SUP>Na. The optimal S value and exposure time of ARG method was found to be 1, 000 and 24 hours. This method that uses the salt instead of gold foil allows hospitals to measure the thermal neutron fluencies easily at many locations for the radiation safety management of routine work and the decomissioning of the cyclotron facility.
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