Eberline PNC-4 Fast or Slow Neutron Detector. The PNC-4 is a battery operated instument used for the detection and measurement of fast or slow Neutron radiation. It has a BF3 type detector with cadmium shield and moderator. The count rate is read out by the Eberline LIN-LOG (TM) presentation. Full scale readings for the four decades are: 500, 5K, 50K and 500K CPM. The PNC-4 is used and has been in long storage. Complete with D cells.