| Issue |
J. Phys. Colloques
Volume 48, Number C6, Novembre 1987
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
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|---|---|---|
| Page(s) | C6-133 - C6-138 | |
| DOI | https://doi.org/10.1051/jphyscol:1987622 | |
J. Phys. Colloques 48 (1987) C6-133-C6-138
DOI: 10.1051/jphyscol:1987622
CONTROL METHODS FOR THE FIELD EMISSION X-RAY SPECTRA AND THEIR APPLICATIONS
E. Sato1, H. Isobe1 et T. Yanagisawa21 Department of Physics, Iwate Medical University, 3-16-1 Honcho-dori, Morioka 020, Japan
2 Department of Radiology, Iwate Medical University, 19-1 Uchimaru, Morioka 020, Japan
Abstract
Control methods for the field emission x-ray spectra and their applications to biomedical imaging are described. The x-ray source used for this research was a single shot type and consisted of the following essential components : a high voltage generator, a simple low impedance pulser with a coaxial oil condenser of 0.2µf-100kV, an impulse switching system utilizing a light communication device, and two types of field emission tubes. The tubes were of the diode type and were connected to a turbo molecular pump which allowed operation at pressures of approximately less than 1 x 10-3Pa. The maximum intensity was about 30C/kg at lm/pulse, and the exposure time was about 1µs. The bremsstrahlung spectra from this source were determined by means of intensity attenuation analysis using a new type of spectrum function (derived by the authors) closely fitting the field emission spectrum distribution. The peak intensity and the energy latitude of the spectra could be controlled. Various kinds of high speed radiography, (e. g., single shot dual energy subtraction radiography, and three dimensional image analysis) were accomplished by controlling the spectrum distribution.