본 연구에서는 손, 머리, 복부 등에 대한 X선 촬영 시행 시 조사야 크기를 최적화할 경우와 최대화할 경우 검사목적부위로부터 30cm 거리에서의 X선 산란선량이 각각 어느 정도인지를 알아보았다. 그 결과 손, 머리, 복부 등에 대한 X선 산란선량은 첫째, 소인촬영의 경우 조사야 크기를 최적화하였을 때 각각 0.08 μSv, 4.39 μSv, 5.56 μSv로 나타났고, 조사야 크기를 최대화하였을 때 각각 0.58 μSv, 33.47 μSv, 35.93 μSv로 나타났으며, 둘째, 성인촬영의 경우 조사야 크기를 최적화하였을 때 각각 0.40 μSv, 14.51 μSv, 18.86 μSv로 나타났고, 조사야 크기를 최대화하였을 때 각각 2.78 μSv, 107.40 μSv, 117.52 μSv로 나타났다(P<0.001). 결론적으로, X선 촬영 시 조사야 크기를 필요한 만큼만으로 최대한 줄여주어 최적화시켰을 때에 최대화시켰을 때보다 피사체 주변의 X선 산란선 발생량은 약 6∼7배 정도 감소하였다.
The purpose of this study is to investigate the scattered dose of X-ray at a distance of 30cm from the area to be examined when X-ray field is the most optimized and maximized when X-ray is performed on hand, skull and abdomen. As a result of scattered dose of X-ray on hand, skull and abdomen, first, when X-ray field was the most optimized upon adult X-ray examination, it was 0.08 μSv, 4.39 μSv and 5.56 μSv, respectively. When x-ray field was maximized, it was 0.58 μSv, 33.47 μSv and 35.93 μSv, respectively. Second, when X-ray field was the most optimized upon pediatric X-ray examination, it was 0.40 μSv, 14.51 μSv and 18.86 μSv, respectively. When x-ray field was maximized, it was 2.78 μSv, 107.40 μSv and 117.52 μSv, respectively(P<0.001). As a result, when the size of X-ray field was decreased down to be necessary and optimal upon X-ray examination, emission of scattered X-ray around specimen is reduced approximately 6?7 times as much as that when it was maximized.