Determines the need for, specifies, and accesses dosimetric and treatment planning equipment including, but not limited to, measurement instruments to calibrate all treatment equipment and monitoring devices, computerized treatment planning systems, computerized water phantom systems with appropriate ionization chambers and diodes, film densitometry systems, etc. Supports all physics aspects of patient treatment including consultation with radiation oncologists, calculation of radiation doses, design and fabrication of treatment aids and assurance of the accuracy of all treatment parameters.