1. College of Science, Chongqing University, Chongqing 400044 , China 2. College of Computer, Chongqing University of Posts and Telecommunication, Chongqing 400065, China 3. College of Automatization, Chongqing University, Chongqing 400044, China
Abstract：In the case of a polychromatic source in X-ray ICT, the variation of attenuation coefficient with energy leads to low energy radiation being absorbed preferentially. In other words, the higher the energy, the more lower the attenuation coefficient. With the transmission thickness augmenting, it is easier for X-ray to transmit the matter. The phenomenon is energy spectrum hardening. Thus, hardening correction has to be done. In the present paper, not only energy spectrum hardening is analyzed by experiment and theory and the relation is stated between attenuation coefficient and transmission thickness, but also the new theory method and the precise accurate theory model for hardening correction of energy spectrum are proposed.
Key words：Continuous spectrum;X-ray;ICT;Hardening correction model
[1] Krohn Barbara R, Silver Michael D. Materials Evaluation. October, 1990, 49: 1296. [2] de Paiva Rogerio Ferreira, Lynch John, Rosenberg Elisabeth, et al. NDT and International, 1998, 31(1): 17. [3] Hanke R, Bobel F. NDT and E International, 1992, 25(2): 87. [4] Guy M J, Castellano-Smith I A, Flower M A, et al. IEEE Transactionon Nuclear Science, 1998, 45(3): 1261.
