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KMID : 1151820170110070565
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Journal of the Korean Society of Radiology
2017 Volume.11 No. 7 p.565 ~ p.569
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An Analysis into the Dose Rate of Photoneutron Occurring in a Linear Accelerator
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Jang Ho-Won
Jin Seong-Jin
Je Jae-Yong
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Abstract
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This research aims at measuring the changes in the dose rate of photoneutron occurring in the process of the investigation into the 10 MV photon beam with a linear accelerator. In addition, the life time of the photoneutron after the end of irradiation was to be analyzed. The photoneutron were measured with a BF3 proportional counter, and the measurement results of the dose rate of the photoneutron were analyzed in 3 parts at intervals of 2 seconds. The measurement results showed that the photoneutron were generated fastest when there was no metal plate inside the radiation field and when there was a lead plate, and that, as for the time that shows the final dose rate at the level of background, the life time was about 1 minute and 40 seconds regardless of the kinds of materials. Therefore, the dose rate according to the time until the photoneutron run out was proved to be different depending on the sorts of the materials and the threshold energy. However, final life time showed similar results regardless of the kinds of the materials, it can be concluded that the kinds of materials don t get involved in the life time of photoneutron.
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KEYWORD
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photon, photoneutron, dose rate, life time
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