Modeling ionization quenching in organic scintillators

Abstract

Ionization quenching models were assessed by evaluating light yield data from multiple organic scintillators and recoil ions over a fission spectrum neutron energy range, important for basic science and applications.

Characterization of organic glass scintillator bars and their potential for a hybrid neutron/gamma ray imaging system for proton radiotherapy range verification

“…The best fit parameters obtained were 𝑆 = (1.46 ± 0.03 sys ± 0.05 stat ) MeVee/MeV and 𝑘 = (9.84 ± 0.01 sys ± 0.59 stat ) mg/MeV/cm 2 . The Birks' coefficient 𝑘 agrees well with the previously published results of Laplace et al [65].…”

On the Origin of the Light Yield Enhancement in Polymeric Composite Scintillators Loaded with Dense Nanoparticles

“…This term points out the origin of the sublinear behavior of ϕ LY vs energy of the ionizing beam when >100 keV photons are employed with dense materials. 59 In polymeric scintillators, it can be considered negligible when <20 keV photons are used. 58 On the other hand, the Onsager term (dE/dx) ONS in the numerator dominates at low E tot values, as in our experiments.…”

“…Specifically, the Birks term indicates the d E /d x value for which the average electron–electron spacing is shorter than their diffusion length during thermalization, thus activating a bimolecular collisional quenching mechanism. This term points out the origin of the sublinear behavior of ϕ LY vs energy of the ionizing beam when >100 keV photons are employed with dense materials . In polymeric scintillators, it can be considered negligible when <20 keV photons are used …”