Perbandingan Nilai Mean Glandular Dose (MGD) dari Penggunaan Filter Molybdenum (Mo) dan Rhodium (Rh) Pada Pesawat Mamografi

anoda made of Molybdenum (Mo) and filters with Molybdenum (Mo) and Rhodium (Rh) materials. This study was conducted to obtain the MGD value of tube voltage for two anode filter combinations of Mo/Mo and Mo/Rh and compare them. This study used mammography, a Nuclear Associates 18-220 phantom with a thickness of 45 mm, RaySafe X2 MAM. Data collection was performed with two exposure modes, namely automatically and manually. Manual exposure uses voltage variations from (23 - 32) kV. The results of automatic exposure obtained the appropriate tube current for the phantom size used, which is 80 mAs. In manual exposure, the MGD value for the Mo/Mo combination is in the range of (0,33 – 1,25) mGy with a percentage error of 11% for a voltage of 32 kV. The MGD value for the Mo/Rh combination is in the range of (0,44 – 1,91) mGy with a percentage error of 13,4% for a voltage of 23 kV. The MGD value of anode filter Mo/Rh combination is higher than the Mo/Mo combination. This is because the atomic number of Rhodium (Rh) is higher when compared to the atomic number of Molybdenum (Mo). In addition to the atomic number, the characteristic X-ray peak energy of the filter material also affects the MGD value. Overall, the values obtained are still within the limits set by BAPETEN Regulation No. 2 of 2018, which is below 3 mGy.