Radiation output is to be measured over a 3 second period. Can exposures of less than 3 seconds meet the requirement as long as the total output meets the requirement?
Yes. The intent of this regulation is to ensure that all mammography units have the capability of achieving the proper film exposure level without excessively long exposure times. Units that are capable of producing at least 21.0 mGy air kerma (2400 mR) within a 3 second period or less meet the requirement.