Neutron energy spectrometers

Claim 1

A NEUTRON ENERGY SPECTROMETER COMPRISING: A FIRST SCINTILLATOR CONTAINING LIQUID HERLIUM 3, A PHOTOELECTRIC TRANSDUCER ELEMENT ADAPTED TO TRANSLATE LIGHT RAYS INTO ELECTRICAL PULSES, A LIGHT-TRANSMITTING PIPE CONNECTING SAID FIRST SCINTILLATOR TO SAID PHOTOELECTRIC TRANSDUCER ELEMENT A SECOND SCINTILLATOR SURROUNDING SAID FIRST SCINTILLATOR, A PLURALITY OF PHOTOMULTIPLIER DEVICES IN COMMUNICATION WITH SAID SECOND SCINTILLATOR, MEANS FOR INTRODUCING NEUTRONS DIRECTLY TO SAID FIRST SCINTILLATOR WHILE PREVENTING DIRECT APPLICATION OF NEUTRONS FROM OUTSIDE SAID SPECTROMETER TO SAID SECOND SCINTILLATOR, SAID FIRST AND SECOND SCINTILLATORS BEING ARRANGED AND CONSTRUCTED SUCH THAT NEUTRONS WITHIN SAID FIRST SCINTILLATOR MAY PASS INTO SAID SECOND SCINTILLATOR, AND AN ANTI-COINCIDENCE GATE CIRCUIT CONNECTED ON THE ONE HAND TO THE OUTPUT OF SAID PHOTOELECTRIC TRANSDUCER AND ON THE OTHER HAND TO THE COMBINED OUTPUTS OF SAID PHOTOMULTIPLIER DEVICES.