Abstract
Embossed radiography is an important technique for imaging target region by decreasing absorption contrast of objects. The high-speed embossed radiography (HER) system consists of a computed radiography (CR) system, an intense plasma flash X-ray generator, and a two-dimensional computer program for shifting the image pixel. In the flash X-ray generator, a high-voltage condenser of 150 nF is charged to 80 kV, and the electric charges in the condenser are discharged to the flash X-ray tube through a four-cable transmission line after closing the gap switch. The molybdenum-target evaporation leads to the formation of weakly ionized spherical plasma, and intense molybdenum K-series X-rays were produced utilizing angular dependence of bremsstrahlung X-ray intensity. High-speed monochromatic radiography was performed using molybdenum flash K-rays, and a two-dimensional HER was carried out utilizing single-energy subtraction after the image shifting. The minimum spatial resolution was equal to the sampling pitch of the CR system of 87.5 μm, and concavoconvex radiography such as phase-differential imaging was performed with X-ray durations of approximately 100 ns.
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