A method for monitoring the real-time irradiation field and irradiation dose of energetic photons has been developed for use in cancer radiotherapy that uses photoproduced positrons. A new detector system consisting of a pair of collimators and a fast crystal scintillator was designed and fabricated. It was successfully operated to confirm the irradiation field by real-time measurements of counting rates, which were found to be proportional to the intensity of the photon beam. These results indicate that this method can be used to monitor the irradiation field as well as the irradiation dose.
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