| abstract |
[Problems to be Solved] A phoswich radiation detector, which can easily discriminate between detection signals on gamma rays and thermal neutrons, and which can selectively acquire signals on thermal neutrons, is provided. n [Means to Solve the Problems] In a phoswich radiation detector having two scintillators and discriminating between thermal neutrons and gamma rays, the detector comprises a scintillator for detecting thermal neutrons, such as LiCaAlF 6 :Eu, which has a light yield of more than 1500 photons/neutron, and a scintillator for detecting gamma rays, which has a permeable end on a shorter wavelength than the light emission wavelength of the thermal neutron scintillator. The scintillator for detecting gamma rays is characterized by being either an organic solid scintillator, such as a plastic scintillator, which does not contain a total amount of 10 mol% or more of elements selected from 6 Li, 10 B and Gd, or an inorganic single crystal scintillator, such as lithium glass (containing 6 Li and Ce) or BGO, which has an effective atomic number Z eff of 30 or larger and which does not contain a total amount of 10 mol% or more of elements selected from 6 Li, 10 B and Gd. |