This research aims at examining the amount of scattered radiation generated during irradiation by adhering structures with different sizes of aluminum prominence and depression to the inside of a radiotherapy room. The irregular aluminum structures were stuck to the wall of a radiotherapy room, and the scattered radiation generated during irradiation was measured. The sizes of the aluminum prominence and depression were 1.5×1.5, 3×3, and 5×5 cm 2 with the width of 60 cm and the height of 60 cm. The distance between TLD and the wall of the radiotherapy room to measure scattered radiation was 310 cm, and the used radiation energy was 6 MV and 15 MV generated from a linear accelerator. The research result showed that the irradiation amount at 6 MV was 100, and at 300 cGy the scattered radiation decreased by the installation of the structure with aluminum prominence and depression, but at 200 cGy, only the scattered radiation of the uneven structure of 5×5 cm 2 decreased. At 15 MV, the irradiation amount was 200 cGy, and at 300 cGy, the scattered radiation was reduced when the rugged aluminum structure was set up, but at 100 cGy, similar result values were produced regardless of the uneven structure. Consequently, installation of an additional structure with aluminum prominence and depression in the present interior structure can decreased the stochastic effect of the scattered radiation generated from the wall of a radiotherapy room and patients.
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