| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Research Abstract |
Quasi-x-ray laser generator : The high-voltage main condenser is charged up to 55 kV by a power supply, and electric charges in the condenser are discharged to the tube after triggering the cathode electrode with the trigger device. The plasma flash x-rays such as laser are then produced. The x-ray tube is a demountable cold cathode triode that is connected to the turbo molecular pump with a pressure of approximately 1 mPa, and the target elements are iron, nickel, copper, molybdenum, silver, and cerium.
Measurement of x-ray spectra from weakly ionized plasma : X-ray spectra from the plasma source were measured by a transmission-type spectrometer with a lithium fluoride curved crystal of 0.5 mm in thickness. The spectra were taken by a computed radiography (CR) system with a wide dynamic range, and relative x-ray intensity was calculated from Dicom digital data. In fact, we observed quite sharp lines of K-series characteristic x-rays such as lasers, while bremsstrahlung rays were hardly
… More
detected.
Divergence by lead slits : In order to measure the difference in characteristics between x-rays from a conventional tube and these from the plasma tubes, we employed two lead slits in order to measure the divergence of the x-rays. As compared with x-rays from a conventional tube with a tungsten target, the characteristic x-rays from linear plasmas of copper and molybdenum were diffused greatly after passing through the two slits.
High contrast angiography using a cerium target x-ray tube : Characteristic x-rays from a cerium target are useful to perform angiography using an iodine-based contrast medium, since the photon energies of K-series lines of cerium are slightly higher than the energy of the K-absorption edge of iodine. In angiography of a larger heart extracted from a dog, using iodine spheres, the coronary arteries were clearly visible
Polycapillary radiography : Using a plane-focus plasma x-ray tube in conjunction with a polycapillary plate, we performed quasi-monochromatic parallel radiography achieved with the CR system. Less
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