Evaluation of Photon and Photoneutron Using High Energy X-ray in Radiation Therapy Room

Abstract

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.

Assessment of human exposure doses received by activation of medical linear accelerator components

“…Although the neutrons generated in this way can expose both patients and radiation operators, there is a significant difficulty in predicting the risk [5]. Accordingly, quantitative analysis results [6][7][8] are being reported through studies on the distribution and characteristics of neutrons in treatment rooms in South Korea and abroad. Furthermore, the dangers posed by neutrons include direct exposure as well as the release of surrounding matter, which can result in secondary exposure to radiation emitted from radioactive materials.…”