Analysis of X-RAY Radiation Exposure Rate in Dual Energy CT Scan Examination Room in Radiology Installation of Bandung Kiwari Regional Hospital

Dual Energy CT Scan is a computed tomography method that uses two different X-ray energy levels to produce more detailed images of body structures. It features a dual X-ray tube detector system. Although CT Scan is a crucial imaging modality in diagnostics, especially in Radiology, its radiation dose is significant, necessitating careful attention to radiation protection aspects for workers and the public. This study measures the radiation exposure rate at the entrances around the Dual Energy CT Scan examination room, which has not been measured for a long time, and checks its compliance with the safe radiation limits set by the National Council on Radiation Protection and Measurements (NCRP) Report No. 147. The study employs a quantitative survey approach conducted directly in the Dual Energy CT Scan examination room at the Radiology Department of Bandung Kiwari General Hospital, with predetermined measurement points. Tube A exposure factors are 100 kV, 124 mAs, and tube B 140 kV, 124 mAs, with the built-in phantom as the research object, using two measurement distances of 30 cm and 100 cm. The results show that the farther the distance, the lower the scattered radiation. The radiation exposure rate at 30 cm showed the highest value at point A (0.16 µSv/h) and the lowest at point F (0.04 µSv/h). At 100 cm, the highest exposure rate was at point A (0.15 µSv/h) and the lowest at point F (0.04 µSv/h). There was a slight crack at the entrance to the CT room, where only point F showed an increase in radiation exposure. Overall, the measurements indicate that the entrance areas are still in good and safe condition for radiation workers and the general public.