Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (07): 70203-070203.doi: 10.11889/j.0253-3219.2014.hjs.37.070203

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

A numerical method for extracting dual-energy value of X-ray transmission image based on MCNP

XIANG An CHEN Ruitao   

  1. (Department of Electrical Engineering, Tongji University, Shanghai 201804, China)
  • Received:2014-03-27 Revised:2014-04-16 Online:2014-07-10 Published:2014-07-07
  • Contact: Ruitao Chen E-mail:082663@tongji.edu.cn

Abstract: Background: Traditional dual-energy X-ray inspection technology serves to classify different materials based on the proper value related with effective atomic number. Purpose: This paper aims to solve the problem of the relevance between the proper value and material’s thickness (thickness effect), which reduces the reliability of dual-energy inspection technology. Methods: A numerical method which combines Simpson formula and sequential quadratic programming (SQP) method is proposed to eliminate the thickness effect of dual-energy values. The process of X-ray inspection is simulated by Monte Carlo method based on MCNP. Probability-classification method is used to evaluate the effectiveness of diminishing error probability of material-classification, and classification boundaries of different materials. A practical X-ray inspection machine is used to verify this method. Results: The experimental results indicate that not only the thickness effect is diminished obviously by this method, but also the classification boundaries are effectively achieved. Conclusion: The dual-energy value of X-ray transmission image can be extracted by our proposed method with effectiveness and practical applicability.

Key words: X-ray, Proper value, Thickness effect, Numerical method, MCNP