title: Experience with a pair of matched diodes for constancy checks.
abstract: A unit is discussed which employs a pair of matched silicon diode detectors to check the constancy of the output, beam quality, field flatness, and symmetry of teletherapy equipment. The unit has proven useful, but the long-term stability of the diode-amplifier system must be considered, because two years of experience has demonstrated significant sensitivity changes in the diodes.
mesh_terms: D011834:Radiation Monitoring / Q000295:instrumentation*; D011882:Radiotherapy, High-Energy / Q000295:instrumentation*