Nuclide identification method based on neighborhood rough set and KNN classification

CHEN Chen; WU Huan; WANG Guofan; YAO Zhengyong

doi:10.3724/j.0253-3219.2026.hjs.49.250382

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Nuclide identification method based on neighborhood rough set and KNN classification

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2026-02-13

- Nuclide identification method based on neighborhood rough set and KNN classification
- NUCLEAR TECHNIQUES Vol. 49, Issue 2, Article number: 020401(2026)
- 作者机构：
  
  重庆建安仪器有限责任公司重庆 400060
- 作者简介：
  
  CHEN Chen, male, born in 1987, graduated from Chongqing University of Posts and Telecommunications with a master's degree in 2013, professor-level senior engineer, focusing on artificial intelligence and γ spectrum analysis
  WU Huan, E-mail: wuh_1982@163.com
- 基金信息：
- DOI：10.3724/j.0253-3219.2026.hjs.49.250382
  CLC： TL81
- Received：10 October 2025，
  
  Revised：2025-11-10，
  
  Published：15 February 2026
- 稿件说明：
移动端阅览
陈宸,吴桓,王国帆等.基于邻域粗糙集和K近邻分类的核素识别方法研究[J].核技术,2026,49(02):020401.

CHEN Chen,WU Huan,WANG Guofan,et al.Nuclide identification method based on neighborhood rough set and KNN classification[J]. NUCLEAR TECHNIQUES,2026,49(02):020401.
陈宸,吴桓,王国帆等.基于邻域粗糙集和K近邻分类的核素识别方法研究[J].核技术,2026,49(02):020401. DOI： 10.3724/j.0253-3219.2026.hjs.49.250382. CSTR： 32193.14.hjs.CN31-1342/TL.2026.49.250382.

CHEN Chen,WU Huan,WANG Guofan,et al.Nuclide identification method based on neighborhood rough set and KNN classification[J]. NUCLEAR TECHNIQUES,2026,49(02):020401. DOI： 10.3724/j.0253-3219.2026.hjs.49.250382. CSTR： 32193.14.hjs.CN31-1342/TL.2026.49.250382.

摘要

针对γ能谱数据的高维特性和噪声干扰导致传统核素识别方法普遍存在识别精度不足与计算效率较低的问题，提出一种融合邻域粗糙集与K近邻分类的核素识别方法，以满足便携式核素识别设备在资源受限环境下的实际应用需求。该方法首先采用主成分分析法(Principal Component Analysis，PCA)对原始1 024维γ能谱数据进行降维，提取出累积贡献率≥99%的主成分，以消除冗余信息并抑制噪声干扰；随后引入邻域粗糙集的属性约简算法，通过定义样本邻域关系并计算属性依赖度，结合启发式前向贪心搜索策略对特征属性进行约简，最大限度保留关键判别信息并提升特征子集的分类鉴别能力；最后将约简后的低维特征输入K近邻分类器，依据距离加权投票机制计算各类核素的置信度，实现高效率、准确的核素识别。基于一套LaBr₃（Ce）探测系统与1 024道多道分析器对识别算法进行实验测试，采集包括12种单一核素及2种混合核素在内的224组γ能谱样本，在STM32F407ZGT6单片机硬件平台上进行测试，在邻域半径

=0.2时对包含特征峰重叠的混合核素在内的测试集的平均识别精度达到98.5%，单次核素识别运行时间控制在140 ms内，显著提升了核素识别的准确性与计算效率，为后续便携式核素识别仪的算法部署提供了可靠保障。

Abstract

Background

The high-dimensionality and inherent noise in gamma spectrum data often lead to low identification accuracy and poor computational efficiency in conventional nuclide identification methods. Therefore

a new method that can provide high accuracy and computational efficiency in portable devices is needed.

Purpose

This study aims to develop an efficient method for nuclide identification by combining neighborhood rough set (NRS) theory and K-nearest neighbor (KNN) classifier.

Methods

This method involved three-stage process. Firstly

principal component analysis (PCA) was applied to gamma spectrum data for dimensionality reduction and reduction of linear redundancy. Subsequently

a heuristic search strategy based on NRS was employed to optimize the feature subset by eliminating redundant attributes. Lastly

the KNN classifier was used for efficient nuclide identification in the reduced low dimensional feature space. In the meantime

the identification method was implemented on an STM32F407ZGT6 platform

and experimental verification was performed with a LaBr₃(Ce) detection system and a 1 024-channel multichannel analyzer.

Results

The experiment used a dataset of 224 gamma spectra

comprising 12 single-nuclide and 2 mixed-nuclide categories was collected in the experiment

and verification results show that an average identification accuracy of 98.5% was achieved by proposed method on the test set with a neighborhood radius of

=0.2. The processing time for a single identification is within 140 ms.

Conclusions

Experimental results confirm the superior generalization performance and high computational efficiency of the proposed method across various scenarios

including mixed-nuclide conditions

hence providing a reliable and efficient technical pathway for efficient nuclide identification in portable radiation detection devices.

关键词

Keywords

references

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