Wavelength-sensitive radiography apparatus

Details Wavelength-sensitive radiography apparatus Wavelength-sensitive radiography apparatus

1984-04-23

1985-08-13

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

378 5, 250374, G01T 1185

Patent

active

045352453

ABSTRACT:
A radiography apparatus comprises a radiation source which is arranged to supply radiation spectra of different energies. The apparatus also comprises a detector which can be adjusted for the radiation spectra so that a strong wavelength discrimination occurs in the measurement signals. In a detector comprising an ionization chamber, there is arranged an auxiliary electrode which can be adjusted in phase with the radiation source so that soft radiation of a soft source spectrum or hard radiation of a hard source spectrum is comparatively favored with respect to its contribution to the measurement signal.

REFERENCES:
patent: 2657315 (1953-10-01), Goldstein
patent: 3974386 (1976-08-01), Mistretta et al.
patent: 4029963 (1977-06-01), Alvarez et al.
patent: 4247774 (1981-01-01), Brooks
patent: 4253024 (1981-02-01), Peschmann
patent: 4323784 (1982-04-01), Conrad
patent: 4376893 (1983-03-01), Whetten
Fenster, Aaron, "Split Xenon Detector for Tomochemistry in Computed Tomography," J. of Computer Assisted Tomography, vol. 2, pp. 243-252, (Jul. 1978).

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