The element used as target material in mammography is which of the following?

Two target materials used for mammography are molybdenum (Z 42) and rhodium (Z 45), the former being the most common. Molybdenum has a K-edge at 20 keV and produces characteristic radiations at 17.4 and 19.6 keV. In order to achieve a more nearly monoenergetic beam, the emerging spectrum is filtered by the same material (Molybdenum, about 0.03 mm thick).