Design and implementation of radioactivity identifying pedestrian portal

Yingrui HU; Xiaoqiang LI

doi:10.11889/j.0253-3219.2016.hjs.39.090403

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Design and implementation of radioactivity identifying pedestrian portal

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-24

- Design and implementation of radioactivity identifying pedestrian portal
- NUCLEAR TECHNIQUES Vol. 39, Issue 9, Article number: 090403(2016)
- 作者机构：
  
  1.西南民族大学电气信息工程学院成都 610041
  2.防化研究院第二研究所北京 102205
- 作者简介：
- 基金信息：
  
  Fundamental Research Funds for the Central Universities, Southwest University for Nationalities
- DOI：10.11889/j.0253-3219.2016.hjs.39.090403
  CLC： TL817
- Received：29 April 2016，
  
  Revised：10 June 2016，
  
  Published：2016-09
- 稿件说明：
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Yingrui HU, Xiaoqiang LI. Design and implementation of radioactivity identifying pedestrian portal[J]. Nuclear techniques, 2016, 39(9): 090403
DOI：

Yingrui HU, Xiaoqiang LI. Design and implementation of radioactivity identifying pedestrian portal[J]. Nuclear techniques, 2016, 39(9): 090403 DOI： 10.11889/j.0253-3219.2016.hjs.39.090403.

摘要

为保护重要场所区域安全，提升防止携带特殊核材料或脏弹等引起的核恐怖威胁的能力，研制了行人放射性快速识别仪。该识别仪由NaI探测器和单片嵌入式现场可编程门阵列（Field Programmable Gate Array

FPGA）组成，采用数字梯形滤波成形技术和幅度谱数据处理优化实现方法，能够在1s内实现γ辐射探测、同位素识别及自动分类。在662 keV处能量分辨率为7.44%，在距离探测器中心点1m处，置信度99%条件下，最低可探测活度41.9kBq，对5类

137

Cs放射源能实现可靠报警，性能达到国外同类产品水平。

Abstract

Background

The SPIR-IDENT(Site Protection Against Intrusion of Radioactive Material)advance spectroscopic pedestrian portal released by MGP company in recent years could detect and identify actual radiological threats in real time

but no similar domestic product with independent property rights exists in China at present.

Purpose

This study aims to develop a radioactivity identifying pedestrian portal with independent property rights to enhance the ability of protection against radiological threats

such as intrusion of special nuclear materials or radiological dispersion devices into critical infrastructure.

Methods

A 2-L NaI detector is employed to connect with a large scale Field Programmable Gate Array(FPGA)based digital processing system.Digital trapezoidal filter

spectroscopy processing block including spectroscopy composition

smoothing and peak-seeking were implemented in a single FPGA

and a μC/OS-Ⅱ soft-core was imported to perform digital spectroscopy stabilization

nuclide identification and classification in this FPGA.The spectra processing method was optimized by using hardware multiplier and hardware divider to improve the algorithm speed to satisfy the system requirement.

Results

Experimental test shows that the radioactivity identifying pedestrian portal can detect and discriminate radioactive at the distance of less than 1m from the center point of detector within 1 s.The energy resolution is 7.44% @662 keV and the minimum detectable activity is 41.9 kBq.

Conclusion

With the large scale embedded FPGA technology and the nuclear pulse digitized processing and shaping technology

a bulk volume NaI detector can be used to implement an effective radioactivity identifying pedestrian portal.

关键词

Keywords

references

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