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Journal Articles Nuclear Inst. and Methods in Physics Research, A Year : 2022

Application of adversarial learning for identification of radionuclides in gamma-ray spectra

Abstract

The rapid and accurate identification of radionuclides brings crucial information for nuclear monitoring to diagnose unknown radiological scenes. Recent studies have used a deep learning approach based on neural networks to develop algorithms that perform well in terms of accuracy and computation time and can also identify radionuclides with a limited number of photons. However, it has been shown that conventional neural networks are not necessarily robust, in the sense that a small particular perturbation of the input data can mislead the networks. A specific learning procedure is necessary to overcome this lack of robustness. In this paper, we show that small perturbations intentionally injected into gamma-ray spectra, with respect to the Poisson statistics, are able to fool the network. We propose applying a robust learning procedure, called "adversarial learning". We evaluate this procedure using a CdTe detector, namely Caliste-HD. We train a Convolutional Neural Network (CNN) with a synthetic database composed of simulated spectra and we test its performance on real data acquired with a Caliste detector.
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Dates and versions

insu-03745328 , version 1 (04-08-2022)

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Zakariya Chaouai, Geoffrey Daniel, Jean-Marc Martinez, Olivier Limousin, Aurélien Benoit-Lévy. Application of adversarial learning for identification of radionuclides in gamma-ray spectra. Nuclear Inst. and Methods in Physics Research, A, 2022, 1033, 166670 (7 p.). ⟨10.1016/j.nima.2022.166670⟩. ⟨insu-03745328⟩
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