Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (11): 110201-110201.doi: 10.11889/j.0253-3219.2019.hjs.42.110201

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

Experimental analysis on equivalent attenuation coefficients of steel

Chaoming SUN,Youping SHENG,Jiqiang GE,Kaihua SUN   

  1. Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2019-08-12 Revised:2019-09-16 Online:2019-11-10 Published:2019-11-18
  • Supported by:
    Technology Basis Fund of China Academy of Engineering Physics(14S105)

Abstract: Background

Equivalent attenuation coefficients are needed to optimize X-ray digital radiography detection parameters of steel foils. However, the coefficients are associated with poly-energetic X-ray beam and are hardly accessible.

Purpose

This study aims to find a practical way to measure the equivalent attenuation coefficients of steel by experimental analysis.

Methods

Firstly, the principle of determining the equivalent attenuation coefficients was analyzed, and the parameters influencing the measurement result were found out. Then, variations of intensity of X-rays which transmitted a 0.05 mm steel foil fore-and-aft were measured by using digital detector arrays (DDAs), and the equivalent attenuation coefficients under different X-ray tube voltages from 30 kVp to 150 kVp were obtained.

Results

Experimental results show that the measured equivalent attenuation coefficients are greater than that of the monochromatic and collimated X-ray beam. The equivalent attenuation coefficients calculated by using the X-ray spectrum at different X-ray tube voltages and the ideal detector sensitivity function tend to agree with the measurement results. Significantly, the equivalent attenuation coefficients analyzed by image quality parameters agree well with the measurement results.

Conclusions

In X-ray digital radiography, the equivalent attenuation coefficient is very different from that of single energy narrow beam X-ray, so it is necessary to measure the equivalent attenuation coefficients that are directly related with image quality index.

Key words: Attenuation coefficient, X-ray, Digital detector arrays, Image quality

CLC Number: 

  • TL812