Study on the effects of aluminium (Al) filter on the measured peak-voltage (kVp) and dose of X-ray diagnostic has been carried out in the Center for Standardization and Radiation Safety Research (PSPKR), Batan, Diagnostic X-ray machine Tanka Model RTO-125 was used in this experiment. Aluminium (Al) filter having high purity of 99.2 percent made in Nilaco, Japan, was used. Peak-voltage (kVp) was…