Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (7): 70203-070203.doi: 10.11889/j.0253-3219.2020.hjs.43.070203

• ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS • Previous Articles     Next Articles

A preliminary study of the performance for high energy neutron radiography convertor

Yang WU,Bin TANG,Yong LIU Bin SUN,Heyong HUO(),Wei YIN()   

  1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2020-02-24 Revised:2020-04-23 Online:2020-07-15 Published:2020-07-16
  • Contact: Heyong HUO,Wei YIN E-mail:huoheyong@163.com
  • About author:WU Yang, male, born in 1980, graduated from China Academy of Engineering Physics with a master's degree in 2006, focusing on nuclear technology and application
  • Supported by:
    Defense Industrial Technology Development Program(JCKY2017212B002);Nuclear Safety Project(41426020401);National Key R&D Program of China(2016YFA0401502)

Abstract: Background

High energy neutron radiography is a potentially powerful method for non-destructive inspection due to the extremely high penetration depth of fast neutrons in comparison with other radiation in most materials of industrial interest. Convertor is one of the key components in a high energy neutron radiography. Plastic scintillator, fiber matrix, pressed fluorescent screen, and waveshift fiber converter, etc. can be used in a high energy neutron radiography system based on charge coupled device (CCD) camera. The performances of these convertors are different.

Purpose

This study aims at performance test of these different convertors as to determine the application characteristics or scenarios of different converters.

Methods

First of all, for the problems in the definition of the detection efficiency of traditional neutron radiography conversion screen, the definition was revised on the basic of physical principle. Then, the efficiency and spatial resolution of the three types of convertor were tested by neutron radiography experiment, and the absolute efficiency was calculated based on experimental system parameter.

Results

Pressed fluorescent screen has the best spatial resolution and waveshift fiber converter has the best absolute efficiency.

Conclusions

The waveshift fiber converter screen achieves a good balance between resolution and efficiency. Pressed fluorescent screen can be used in high-energy neutron photography scenes with high resolution requirements. The plastic scintillator is only suitable for high-energy neutron photography under the conditions of strong neutron source and large collimation ratio, and its high sensitivity to γ-rays has a great impact on imaging quality.

Key words: High energy neutron, Radiography, Converter

CLC Number: 

  • TL99