Experimental study of specific fluorescence features of organic scintillators during their interactions with fast neutrons and gamma-quanta

Peculiarities of a fast component of organic scintillator luminescence when registering gamma quanta and fast neutrons have been experimentally investigated. An experimental method for conducting the investigations is described. In which by means of the Brooks integrated circuit the changes in the charge values on the photomultiplier anode were tracked both depending on the energy of registered particles and on the RaCa parameter value where Ra -the anode resistance, Ca -the the anode capacity. The investigations were carried on on a stilbene crystal excited with 0.02-5 MeV Compton electrons and 0.2-10 MeV recoil protons. The parameter S=Qsub(e)/Qsub(p) characterizing the difference in peculiarities of scintillation luminescence (quenching) was determined from the results of the measurements of Qsub(e) (recoil electron) and Qsub(p) (recoil protons) charges. The experimental facility diagram, by means of which the parameter values S were determined, is given. The FEU-93 photomultiplier, the Brooks circuit, a differential discriminator, linear amplifier and LP-4050 512-channel amplitude analyzer are main facility elements. It is concluded on the basis of comparison of calculated and experimental functions S=f(E) that there is an explicit difference in weight coefficients and in constants of drop of fast luminescence components for the Compton electrons and recoil protons. It proves the fluorescence dependence on a type and energy of nuclear particles registered with an organic scintillator and permits to create fast-response scintillation spectrometers sensitive to a radiation type