Abstract
The results of the scattery distribution in the fluoroscopy X-ray room were as follows. When the measurement was done at the same height with the table, measured value was 0.78 mGy/min ~ 0.04 mGy/min (95%) within 50 cm and 250 cm. At 50 cm below the table, it was 0.17 mGy/min ~ 0.02mGy/min (86%) and at 50 cm above the table was 1.37 mGy/min ~ 0.05 mGy/min (96%), displaying a decrease. At the same time, the amount of rays were reduced in 50 ~ 60% at the same height with the table than the location 50 cm above the table, 90~95% of reduction rate was observed at 50 cm below the table. For the collimator, comparing to the case when it was completely open, the amount of ray was reduced from 0.78 mGy/min to 0.16 mGy/min at 50cm away and 0.04 mGy/min to 0.01 mGy/min at 250cm away thus approximately 80% on average was reduced when the collimator was reduced to 25%. Comparing with the case when there was a object on the table, the amount of scatter ray was reduced by 96.7% at every location when there is not a object on the table.
투시검사실내 공간산란선 분포에 대한 정확한 정보와 환자, 검사 자 등에 대한 피폭을 줄이고자 투시용방사선 발생장치를 이용한 실험결과는 다음과 같았다. 테이블과 동일한 높이의 경우 산란선은 50 cm지점과 250 cm 지점에서 0.78 mGy/min ~ 0.04 mGy/min (95 %), 테이블 하 방향 50 cm의 경우 0.17 mGy/min ~ 0.02 mGy/min (86 %), 테이블 상 방향 50 cm 의 경우 1.37 mGy/min ~ 0.05 mGy/min (96 %) 로 감소하였고 상 방향 50 cm 보다 수평지점에서 50 ~ 60% 선량 감소를 나타냈고 하 방향 50 cm 지점에서는 90 ~ 95%정도의 감소율을 나타냈다. 조사야 조절장치의 경우 25%로 줄였을 때 50 cm 지점에서 0.78 mGy/min 에서 0.16 mGy/min 으로, 250 cm 지점에서 0.04 mGy/min 에서 0.01 mGy/min으로 평균 80% 정도 감소하였다. 피사체의 유무의 경우 피사체가 없는 경우 모든 측정지점에서 평균 96.7% 공간 산란선량이 감소하였다.