title: An instrument for the rapid check of output, energy and field symmetry of supervoltage therapy equipment.
abstract: Seven of the described instruments have been produced and are in use at radiation therapy centers in Washington and Oregon. The device has already served its purpose to alert the radiotherapist to a malfunction in his machine on numerous occasions.
mesh_terms: D011834:Radiation Monitoring / Q000295:instrumentation; D011882:Radiotherapy, High-Energy / Q000295:instrumentation*