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KMID : 1151820190130040667
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 4 p.667 ~ p.674
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The Measurement of Spatial Dose Rate by Gravity Ventilation after Technegas Scanning
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Kim Sung-Bin
Won Do-Yeon
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Abstract
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Because examination with technegas produces images through simple diffusion accumulation, the examination room can become contaminated after scan. Therefore, radiation workers and patients awaiting examination will be affected by internal exposure from technegas inhalation. Before and after gravity ventilation, I am trying to find a way to reduce the exposure dose of waiting patients according to a comparative analysis of horizontal spatial dose rates over time. Spatial dose ratio were measured for 10 minutes from various distances and angles around ventilator's location before and after gravity ventilation. Then, mean values, standard deviation and reduction ratio were calculated. The highest reduction rate of gravity ventilation was 95.31% and the highest reduction ratio was 1 to 3 minutes. Therefore, the gravity ventilation could reduce the exposure dose of radiologic technologists, waiting patients, patient guardians and nurses. In conclusion, the reduction of the exposure dose during the technegas ventilation study through gravity ventilation will play a role in optimiging the protection and it is in accordance with the recommended reduction of the medical exposure by ICRP 103.
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KEYWORD
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technegas, internal exposure, spatial dose ratio, gravity ventilation, exposure dose
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