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The Study About Attenuation of Scatter Ray According to Distance Inverse Square Law at General Projection  

Jeon, Min-Cheol (Department of Radiology, Chungnam University Hospital)
Lim, Hyun-Soo (Department of Bio-Medical Engineering, Chungnam University)
Han, Man-Seok (Department of Radiology, Chungnam University Hospital)
Publication Information
Journal of radiological science and technology / v.34, no.3, 2011 , pp. 183-188 More about this Journal
Abstract
We studied the optimal location where the radiation dose of radiological technologists is minimally measured. The measured scatter dose has been compared with the distance inverse square law. We measured the primary X-ray with different tube conditions (60, 70, 81 and 90 kVp) and distances (60, 120 and 180 cm). The scatter ray has been measured with various locations (42.5, 52.4 and 62.4 cm for front and back side, 0 to 60 cm with 10 cm interval for left and right side). The results of this study showed that the dose of primary X-ray was attenuated to 20.52 (27.20%), 28.58 (25.20%), 38.82 (26.32%) and 48.20 mR (26.27%) for each tube voltages at 120 cm. In addition, The dose were 7.06 (8.91%), 9.90 (8.73%), 13.64 (9.25%) and 16.60 mR (9.05%) at 180 cm. As for the scatter in front and back side, the attenuated dose were 0.15 mR (23.09%) and 0.15 mR (22.08%) at 120 cm, and 0.07 mR (10.43%) and 0.06 mR (8.83%) at 180 cm. Scatter was decreased in third quadrant. Therefore, it is recommended that radiological technologists should keep long distance from the object.
Keywords
distance inverse square law; first ray; scatter ray; radiation dose;
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Times Cited By KSCI : 1  (Citation Analysis)
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