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X-Ray Spectral Distributions from Thick Tungsten Targets in the Energy Range 12 To 300 Kv*

Published online by Cambridge University Press:  06 March 2019

Ellery Storm ,
Harvey I. Israel  and
Douglas W. Lier
Ellery Storm
Affiliation:
Los Alamos Scientific Laboratory, University of California Los Alamos, New Mexico 87544
Harvey I. Israel
Affiliation:
Los Alamos Scientific Laboratory, University of California Los Alamos, New Mexico 87544
Douglas W. Lier
Affiliation:
Los Alamos Scientific Laboratory, University of California Los Alamos, New Mexico 87544
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Abstract

Bremsstrahlung emission from four x-ray tubes operating at 12 to 300 kV was measured. Spectral distributions are given in terms of absolute-photon and energy fluxes. Silicon and germanium semiconductors, sodium iodide scintillators, and a xenon proportional counter were used to measure the spectra. Detector distortions were corrected by assuming an undistorted spectrum, distorting the spectrum with a Monte Carlo computer program, and comparing the results with measurement. The assumed undistorted spectrum was revised until the Monte Carlo calculation gave satisfactory agreement with spectral measurements from all four types of detectors. The effects on the spectra of varying the tube potential, tube current, target aperture, and detector aperture were investigated. Corrections for the intervening material and the solid angle subtended by the detector were applied to obtain the absolute-photon and energy flux from the target. Total fluxes in the L lines, K lines, and continuum are given. X-ray-production efficiencies varied from 0.026% at 12 kV to 1% at 300 kV. The constant of proportionality varied in the range (0.23 to 0.73) x 10-6 kV-1.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 15: Twentieth Annual Conference on Applications of X-ray Analysis, August 11-13, 1971 , 1971 , pp. 339 - 351
Copyright
Copyright © International Centre for Diffraction Data 1971

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Footnotes

*

Work performed under the auspices of U.S. Atomic Energy Commission

References

1. International Commission on Radiation Units and Measurements (ICRU) Report 10b, “Physical Aspects of Irradiation,” 1962.Google Scholar
2. International Commission on Radiation Units and Measurements (ICRU) Report 17, “Radiation Dosimetry: X-Rays Generated at Potentials of 5 to 150 kV,” 1970.Google Scholar
3. Dyson, N. A., “The Continuous X-Ray Spectrum from Electron- Opaque Targets,” Proc. Phys. Soc. 73, 924 (1959).Google Scholar
4. Placious, R. C., “Dependence of 50- and 100-kaV Bremsstrahlung on Target Thickness, Atomic Number, and Geometric Factors,” J. Appl. Phys. 38, 2030 (1967).Google Scholar
5. Ehrlich, M. J., “Scintillation Spectrometry of Low-Energy Bremsstrahlung,” J. Res. Natl. Bur. Std. 54, 107 (1955).Google Scholar
6. Hettinger, G. and Starfelt, N., “Bremsstrahlung Spectra from Roentgen Tubes,” ActaRadiol. 50, 381 (1958).Google Scholar
7. Unsworth, M. H. and Greening, J. R., “Experimental Continuous and L-Characteristic X-Ray Spectra for Tungsten Target Tubes Operated at 15 to 30 kV,” Phys. Med. Biol. 15, 631 (1970).Google Scholar
8. Israel, H. I., Lier, D. W., and Storm, E., “Comparison of Detectors Used in Measurement of 10- to 300-keV X-Ray Spectra,” Nucl. Instr. Meth. 91, 141 (1971).Google Scholar
9. Storm, E., Israel, H. I., and Lier, D. W., “Bremsstrahlung Emission Measurements from Thick Tungsten Targets in the Energy Range 12 to 300 kV,” Los Alamos Scientific Laboratory Report 4624 (1971).Google Scholar
10. Storm, E. and Israel, H. I., “Photon Cross Sections from 1 keV to 100 MeV for Elements Z = 1 to 2 = 100,” Nuclear Data Tables A7, 565 (1970).Google Scholar
11. Compton, A. H. and Allison, S. K., X-Rays in Theory and Experiment, D. Van Nostrand Co., New York, 1935, p. 89–90.Google Scholar
12. Evans, R. D., The Atomic Nucleus, McGraw-Hill, New York, 1955, p. 616.Google Scholar