X-ray spectrometer

Details X-ray spectrometer X-ray spectrometer

1991-10-29

1993-04-06

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

G01T 117, G01T 136

Patent

active

052006255

ABSTRACT:
An X-ray spectrometer is equipped with a pulse-height selector (pulse-height analyzer) for selecting pulse heights of amplified output pulses which fall within a specific range, and a counter for counting the output pulses selected by the pulse-height selector. A compensator which compensates for an energy shift in a proportional counter tube is provided between a linear amplifier, which amplifies the output pulses from the proportional counter tube, and a driving power supply of the proportional counter tube. The X-ray spectrometer has a main pulse-height selector for selecting the pulse height of output pulses from the proportional counter tube, and a subordinate pulse-height selector whose selective window width is within the window width of the main pulse-height selector. A shift in the pulse-height distribution of the output pulses from the proportional counter tube is determined from the counting rate of the subordinate pulse-height selector, the energy shift of the proportional counter tube is detected from the shift in the pulse-height distribution, and the driving power supply of the proportional counter tube is controlled so as to eliminate the shift in the pulse-height distribution of the output pulses from the proportional counter tube, thereby compensating for the effects of the energy shift. The difference or ratio between detection values obtained from the plurality of subordinate pulse-height selectors is determined to obtain a feedback signal, and the driving power supply of the proportional counter tube is driven by this feedback signal.

REFERENCES:
patent: 3752984 (1973-08-01), Scott et al.
patent: 4075486 (1978-02-01), Sipila et al.
Barr et al, "A Large-Area Transaction Radiation Detector", Nucl. Instr. & Meth. in Phys. Res., Sec A Sep., 1990, p. 465.
Kelly et al, "Automatic Compensation for Intensity Dependent Pulse Amplitude Shift in Gas Proportional X-Ray Detector", Conference: Soc. Applied Spec., Pub: Soc. Applied Spec. N.Y., N.Y. (1971), p. 96.

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