A Method for Measuring Spectral and Time Characteristics of Mixed Pulsed Gamma-Neutron Fields with Scintillation and Cherenkov Detectors with Nanosecond Time Resolution

摘要

A method for measuring spectral and time characteristics of pulsed mixed (n, y) fields is described. The essence of this method is that a sequence of signals from individual (n, γ) particles registered by (n, γ) detectors is written in a computer with the subsequent amplitude-time analysis of the signal parameters. Fast scintillation and Cherenkov detectors with FWHM of pulses of ～1.5 and 2.5 ns, respectively, are used as (n, γ) detectors. A TDS-3054 broadband digital oscilloscope records signals and transmits them to the computer through a GPIB-USB interface. The equipment used ensures efficient detection of (n, γ) particles at detector counting rates of up to ～2×10{sup}8 pulses/s. The efficiency of this method has been tested in measurements of characteristics of (n, y) radiation fields from an HHT-031 pulsed neutron generator and from a copper target irradiated with a beam of carbon nuclei with an energy of 200 MeV/amu from the TVN-ITEF acceleration-storage complex.