This photon detector was developed at Bendix Research Laboratories Division. According to the Model M310 documentation, the detector was designed to be used as a UV light detector in a vacuum spectrograph. Other applications include high altitude solar radiation detection, nuclear radiation detection, satellite radiation measurements, and photon and particle counting. It can also serve as a mass spectrometer detector. This commercial unit was built for a laboratory mass spectrometer.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.