This study aimed to evaluate the radiation dose for patients during mammography examination in two different centers (ALNeelain Diagnostic Center and Ahfad Family Health Center). Measurements were performing to estimate Mean Glandular Dose (MGD) and to evaluate the factors affecting the dose in mammography for number of 60 patients. The obtained results shown that The mAs in Ahfad Family Heath Center was higher than NDC, the exposure parameter mAs and mAs within the standard range of parameters exposure in Mammography. The tube voltage should be between (22-35) kVp and the tube current exposure time product (mAs) should be at least (4- 400), take into account all examinations included two CC and two MLO projections per patient. The mean of incident air kerma (Ki) in Ahfad Family Heath Center was higher than NDC due to different mammography x-ray machine, different FFD and used different exposure parameter. The different in values of ESAK were observed in the two hospitals mainly due to kVp accuracy problems