scholarly journals Plutonium metal vs. oxide determination with the pulse-shape-discrimination-capable plastic scintillator EJ-299-33

2014 ◽  
Vol 767 ◽  
pp. 188-192 ◽  
Author(s):  
S.A. Pozzi ◽  
M.M. Bourne ◽  
J.L. Dolan ◽  
K. Polack ◽  
C. Lawrence ◽  
...  
Keyword(s):  
Pulse Shape ◽  
Plastic Scintillator ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Plutonium Metal

scholarly journals Pulse shape simulations for organic scintillation detectors using Geant4

2021 ◽  
Vol 253 ◽  
pp. 11002
Author(s):  
Caroline Holroyd ◽  
Michael Aspinall ◽  
Tom Deakin
Keyword(s):  
Pulse Shape ◽  
Plastic Scintillator ◽  
Organic Liquid ◽  
Simulated Data ◽  
Pulse Shape Discrimination ◽  
Scintillation Detectors ◽  
Shape Discrimination ◽  
Radiation Fields ◽  
Plastic Scintillators ◽  
Temporal Pulse

The accurate simulation of the temporal pulse shapes from organic scintillation detectors capable of pulse shape discrimination (PSD) presents the opportunity to assess the pulse shape discrimination of these detectors prior to fabrication. The aim of this study is the simulation of the temporal pulse shapes from EJ-276, a PSD-capable plastic scintillator developed by Eljen Technologies. PSD plastic scintillators are increasingly replacing organic liquid scintillators for the detection of neutrons in the presence of mixed radiation fields for nuclear security applications. Plastics are inexpensive, robust and can be fabricated in a variety of shapes and sizes. They offer a solid-state alternative to liquid scintillators which can be difficult to transport due to the risk of leakage. However, the PSD performance of plastic scintillators has been observed to decrease due to various factors which combine to influence the overall shape of the pulse. The Monte Carlo toolkit Geant4 has been used to simulate the temporal pulse shapes from an EJ-276 plastic scintillator coupled to a photomultiplier tube (PMT). All three decay time components of EJ-276 have been modelled, utilising new methods available in the latest version of Geant4, for two different scintillator geometries. The simulated n/γ pulse shapes reproduce the features important for PSD. Future work will involve integrating the temporal response of the PMT with existing pulse shape simulations. Simulated data will then be compared with experimental measurements.

scholarly journals Gamma-Ray Spectrometry in the Energy Range 0.5–5 MeV

1971 ◽  
Vol 41 ◽  
pp. 58-62 ◽  
Author(s):  
F. Albernhe ◽  
C. Doulade ◽  
I. M. Martin ◽  
R. Talon ◽  
G. Vedrenne
Keyword(s):  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Plastic Scintillator ◽  
Pulse Shape Discrimination ◽  
Field Of View ◽  
Gamma Ray Spectrometry ◽  
Shape Discrimination ◽  
Equatorial Latitude ◽  
Compton Electron

A stilbene scintillator detector allowing gamma-ray spectrometry in the range 0.5–5 MeV is presented. A complete elimination of charged particles is obtained by a plastic scintillator anticoïncidence jacket. Separation of gamma rays from neutrons is made by pulse shape discrimination technique with over 99% efficiency. This detector which has a 4 π field of view has been made as light as possible to avoid perturbation due to secondary production in the apparatus. The correction of the edge effects and the method of conversion from experimental Compton electron spectrum to gamma-ray spectrum are explained.Results from balloon launchings at three latitudes (Kourou Guyana: 10 N, Aire sur l'Adour: 46°N and Oboziersky U.S.S.R.: 62 °N) are briefly presented. The detection possibility with balloons of galactic gamma rays at equatorial latitude is shown. The atmospheric part of the flux at the equator is deduced from the measurements at higher latitudes, (46 °N and 62 °N) where the galactic component is of negligible importance. Assuming a power law spectrum and after correction of the atmospheric absorption we obtain for the galactic spectrum the expression dN/dE = 1.1 × 10−5E−1, 2 photons/cm2 s sr keV. This spectrum agrees with the results of ERS 18 satellite given by Vette et al. showing an excess of flux for energies higher than 1 MeV.

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