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Communication Dans Un Congrès Année : 2022

Development of a hybrid radiation monitor based on NaI(Li+Tl) and PVT scintillators for homeland security

Résumé

The current geopolitical context and the national requirements of a continuous survey in strategical high frequency civil zones such as airports, seaports and train stations conduct to a growing need to develop performant radiation monitors. In this framework, LIST Institute from CEA Paris-Saclay is currently investigating the development of a novel system based on the coupling of inorganic/organic scintillators, respectively NaILTM from Saint-Gobain Crystals and EJ-200 and plastic scintillators from Eljen technology. Traditional technologies are mainly based on either gamma-ray sensible detectors such as for instance NaI(Tl) like the DIRAD radiological monitor, either on neutron detectors such as classical Radiation Portal Monitors (RPM) based on 3He counters. Recent generation RPM based on plastic scintillators only, proposed for instance by Bertin Technologies or Symetrica Inc., allows both gamma and neutron signatures detection. Nevertheless, their radiological identification capabilities are limited due to the low energy resolution of PVT. To counter this drawback, we hereby propose to deploy NaILTM scintillators, which present similar energy resolution capabilities than traditional NaI(Tl), allowing the identification of distinct radiological threats. Moreover, these detectors discriminate radiological from nuclear threats by means of Pulse Shape Discrimination (PSD) using 6Li component and associated 6Li(n,α)3H reaction. Additional PVT organic scintillators surrounding the NaILTM detectors enable an optimal thermalization of the incident neutron flux in presence of a nuclear threat. In addition, the collected signal of interest (total energy spectra and incident particles detected in coincidence) provides additional information on the threat's nature and increases the systems sensitivity. First proof-of-concept experiments with a 3× 3 NaILTM detector surrounded by cylindrical shaped EJ-200 scintillators and a CAEN® DT5730B digitizer are reported in this paper.
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Dates et versions

cea-04239540 , version 1 (12-10-2023)

Identifiants

  • HAL Id : cea-04239540 , version 1

Citer

Roberto de Stefano, Victor Buridon, Clément Lynde, Gwenolé Corre, Simon Foucambert, et al.. Development of a hybrid radiation monitor based on NaI(Li+Tl) and PVT scintillators for homeland security. 2022 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room Temperature Semiconductor Detector Conference, Nov 2022, Milan, Italy. ⟨cea-04239540⟩
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