• Journal of the Korean Society of Radiology
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• v.10 no.6
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• pp.427-433
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• 2016

Recently increased use of high energy x-ray in radiation therapy, so therapeutic efficiency of tumors that located deep part also increased. However, photoneutron is problem which is generated caused by photoneuclear reaction. Photoneutron is continually required management because of that is more harmful than photon. In this regard, the study utilizing simulation of the Monte Carlo method is actively progress about photoneutron but measure is deficient. So this study was analyzed the correlation between the measured photon and photoneutron by radiation measurement device. As a result, photons were reduced when distance is farther and field size is smaller. But photoneutron were increased when field size is smaller and increased to a certain distance then reduced.