Digital Pulsed System of Shadow Images Recording for Radiography of Objects of Large Optical Density

Abstract

The authors provide the development results of one channel of the digital multiframe recording system for the radiography of objects having large optical thicknesses. The recorder is created based on the modern CCD matrix and quick-acting unit that operates as an electron-optical shutter. Scintillators based on the monocrystal LYSO were used to transform the ionizing radiation into the visible spectrum. Spatio-time characteristics of the recording system were investigated in the laboratory; the system operability was also checked. It was shown that the recording system allows recording with time exposure ≥ 100 ns. The unit of the multiframe recording system was tested on the internal polygon of FSUE “RFNC-VNIIEF”. Testing powering of the mobile cyclic accelerator (ironless pulsed betatron) was also performed. The X-ray patterns of the static test objects were obtained. The thickness of the X-rayed lead test object was ∼90 mm at 4 m from the target at 11% contrast. The value of a capacitive storage of the pulsed powering system of the betatron electromagnet was C = 900 µF. The dimension of the tantalum target was 6×6 mm; the full width of the output gamma pulse at half maximum in a single frame mode was ∼100 ns.