A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification

Hao-Lin Liu; Hai-Bo Ji; Jiang-Mei Zhang; Cao-Lin Zhang; Jing Lu; Xing-Hua Feng

doi:10.1007/s41365-022-01150-7

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A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification

NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH | Updated：2022-12-30

- A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification
- A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification
- 核技术（英文版） 2022年33卷第12期文章编号：158
- Affiliations：
  
  1.Department of Automation, University of Science and Technology of China, Hefei 230026, China
  2.School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China
  3.Fundamental Science on Nuclear Wastes and Environment Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China
- Author bio：
  
  †lhl0502@mail.ustc.edu.cn
- Funds：
  
  National Defense Fundamental Research Project(JCKY2020404C004);Sichuan Science and Technology Program(22NSFSC0044)
- DOI：10.1007/s41365-022-01150-7
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A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification[J]. 核技术（英文版）, 2022,33(12):158

Hao-Lin Liu, Hai-Bo Ji, Jiang-Mei Zhang, et al. A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification[J]. Nuclear Science and Techniques, 2022,33(12):158
A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification[J]. 核技术（英文版）, 2022,33(12):158 DOI： 10.1007/s41365-022-01150-7.

Hao-Lin Liu, Hai-Bo Ji, Jiang-Mei Zhang, et al. A novel approach for feature extraction from a gamma-ray energy spectrum based on image descriptor transferring for radionuclide identification[J]. Nuclear Science and Techniques, 2022,33(12):158 DOI： 10.1007/s41365-022-01150-7.

摘要

Abstract

This study proposes a novel feature extraction approach for radionuclide identification to increase the precision of identification of the gamma-ray energy spectrum set. For easier utilization of the information contained in the spectra, the vectors of the gamma-ray energy spectra from Euclidean space, which are fingerprints of the different types of radionuclides, were mapped to matrices in the Banach space. Subsequently, to make the spectra in matrix form easier to apply to image-based deep learning frameworks, the matrices of the gamma-ray energy spectra were mapped to images in the RGB color space. A deep convolutional neural network (DCNN) model was constructed and trained on the ImageNet dataset. The mapped gamma-ray energy spectrum images were applied as inputs to the DCNN model, and the corresponding outputs of the convolution layers and fully connected layers were transferred as descriptors of the images to construct a new classification model for radionuclide identification. The transferred image descriptors consist of global and local features, where the activation vectors of fully connected layers are global features, and activations from convolution layers are local features. A series of comparative experiments between the transferred image descriptors, peak information, features extracted by the histogram of the oriented gradients (HOG), and scale-invariant feature transform (SIFT) using both synthetic and measured data were applied to 11 classical classifiers. The results demonstrate that although the gamma-ray energy spectrum images are completely unfamiliar to the DCNN model and have not been used in the pre-training process, the transferred image descriptors achieved good classification results. The global features have strong semantic information, which achieves an average accuracy of 92.76% and 94.86% on the synthetic dataset and measured dataset, respectively. The results of the statistical comparison of features demonstrate that the proposed approach outperforms the peak searching based method, HOG, and SIFT on the synthetic and measured datasets.

关键词

Keywords

Radionuclide identificationFeature extractionTransfer learningGamma energy spectrum analysisImage descriptor

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