[2H09-10] Detector Development 1

[2H09] Development of Material Discrimination Technique by High Energy X-Ray CT

(1)Evaluation of Material Discrimination Ability with Multi-High Energy X-Ray CT Images

*Yasushi Nagumo¹, Katusnori Ueno¹, Takahiro Tadokoro¹, Yuri Yoshihara¹, Yutaka Kometani², Junji Iwasa² (1. Hitachi, 2. HGNE)

Keywords:Fuel debris, Nuclear fuel material, Radioactive waste, Material discrimination, High energy X-ray CT

For storage of fuel debris retrieved from Fukushima Daiichi NPP, it is considered to discriminate fuel debris and radioactive waste according to the amount of nuclear fuel materials. High-energy X-ray CT is one of the non-destructive assay techniques to measure the mass of high-density objects like nuclear fuel materials with high throughput. CT is possible to evaluate the mass by measuring 3D density distribution but difficult to identify materials when there are effects of bulk density. In this research, material discrimination ability by dual energy CT images using different X-ray energy distribution was evaluated. As a result, the prospect that heavy material like uranium is able to be discriminated from iron and concrete was obtained.