Job Purpose:  Primarily and professionally engaged in the design optimization, technical evaluation and precise and accurate delivery of radiation for patient care.  Responsible for the radiation safety of patients and staff and for the design and implementation of the quality management that involve the use of external beam radiotherapy equipment and therapeutic isotopes. Essential Functions: Calibrate therapy equipment in a manner suitable for accurate radiation dose delivery. Direct the determination of radiation dose distributions in patients undergoing treatment (i.e. computerized dosimetry planning or direct radiation measurement). Direct the acceptance testing of new equipment and treatment devices. Direct the design and construction