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KMID : 1038720170280020045
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Progress in Medical Physics
2017 Volume.28 No. 2 p.45 ~ p.48
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Assessment of Radiation Dose from Radioactive Wedge Filters during High-Energy X-Ray Therapy
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Back Geum-Mun
Park Sung-Ho
Kim Tae-Hyung
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Abstract
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This paper evaluated the amount of radiation generated by wedge filters during radiation therapy using a high-energy linear accelerator, and the dose to the worker during wedge replacement. After 10-MV photon beam was irradiated with wedge filter, the wedge was removed from the linear accelerator, and the dose rate and energy spectrum were measured. The initial measurement was approximately 1 uSv/h, and the radiation level was reduced to 0.3 uSv/h after 6 min. The effective half-life derived from the dose rate measurement was approximately 3.5 min, and the influence of AI-28 was about 53%. From the energy spectrum measurements, a peak of 1,799 keV was measured for AI-28, while the peak for Co-58 was not measured in the control room. The peaks for Au-106 and Cd-105 were found only measurement was done without wedge removement from the linear accelerator. The additional doses received by the radiation worker during wedge replacement were estimated to be 0.08?0.4 mSv per year.
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KEYWORD
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Radiation dose, Wedge filter, Linear accelerator
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