Neutron/gamma discrimination properties of composite scintillation detectors

Abstract

A composite scintillator is a solid solution, which contains the grains of organic molecular single crystal introduced into a polymer matrix and placed inside the housing. Hereunder, we present n/γ discrimination properties of four composite scintillators; two of the them are based on p-terphenyl and two others-on stilbene. The results obtained with a stilbene single crystal and a liquid scintillator BC501A are shown as a comparison. Initial conclusion, which is drawn from the paper, is that composite scintillators could be an alternative substitution for commonly used liquid scintillators.

Comparative study of neutron and gamma-ray pulse shape discrimination of anthracene, stilbene, and p-terphenyl

“…Emission wavelengths of anthracene, stilbene, and p-terphenyl were 445-525, 400-500, and 350-450 nm, respectively. These emission wavelengths were consistent with previous literatures [2,9] and emission wavelengths were same as those under UV excitation (photoluminescence). Fig.…”

“…As a result, FOM of anthracene, stilbene, and p-terphenyl were 1.53, 1.10, and 1.26, respectively. Similar plots but with different definition of FOM were examined by many groups [9,[15][16][17][18] and to our knowledge all evaluations are essentially equal. In one of the recent reports, Iwanowska et al [9] reported PSD capabilities of stilbene and p-terphenyl based organic scintillators and they concluded that p-terphenyl based one was better.…”

“…In this work, we compared neutron-gamma discrimination capability of famous organic scintillators such as anthracene (treated as a standard organic scintillator in [2]), stilbene [8], and recently introduced p-terphenyl [9,10] based on the pulse shape discrimination (PSD) technique. Fig.…”

Development of large-area composite stilbene scintillator for fast neutron detection

“…Contrary to the gamma-ray spectrum of the composite stilbene scintillator as shown in Figure 9 (b), it is difficult to accurately determine the Compton edge location from the neutron spectrum due to a poor energy resolution. In this study, the peak location was determined by a Gaussian fit resulting in a large uncertainty [17]. The composite stilbene scintillator and the singlecrystal stilbene scintillator showed good energy linearity, as seen in Figure 13.…”

Recent Developments in Count Rate Processing Associated with Radiation Monitoring Systems

“…In many cases, radiation monitoring requires the counting of a signal from a first radiation source within an interference signal induced by a second particle emitter, namely α/β vs. γ; n vs. γ, γ vs. γ … The most efficient techniques consist in the recognition of the particle origin associated with each individual pulse event by coincidence/anti-coincidence, pulse height discrimination (PHD) or pulse shape discrimination (PSD) [16]. However, event-by-event discrimination techniques may be found unreliable in particular mixed field configurations.…”