Method and system for detecting neutrons and X or Gamma photons-simultaneously and selectively.

摘要

This device comprises a detector, associated with a photomultiplier (14) and including a scintillator (2) sensitive to neutrons and a scintillator (4) sensitive to X-photons or gamma-photons, and a means (6) for guiding to the photomultiplier the photons generated by the neutron-sensitive scintillator and attenuating the radiation consisting of these photons, which produces a shift to low energies of the spectrum of the scintillations due to the neutrons, which spectrum is supplied by the photomultiplier. The scintillators and this means are chosen so that the scintillations due to the neutrons and the photoelectric peak of the X-photons or gamma-photons are in energy bands which are separated from each other and from the background noise of the photomultiplier. Application to measurements in which neutrons and X-photons or gamma-photons are to be counted separately.