Radiation measuring device
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorIssei Mori
Life of this patent
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Abstract
A radiation measuring device comprising a radiation detector for detecting radiation quantum arriving in the Poisson distribution, a phase height analyzer for analyzing a height of an output signal from the detector to extract signal components at a level within a predetermined level, converter for integrating an output signal from the detector to produce pulses of which the number corresponds to the integrated value, a switch for selecting the output signal from the analyzer when the number of arrival photons is smaller than a predetermined value and for selecting the output signal from the converter when the number of photons is larger than the predetermined value and a counter for counting output pulses of the selected analyzer or counter.
Claims5
A radiation measuring apparatus comprising:
- detecting means for detecting photons of radiation impinged thereon and producing pulses thereof, the photons impinging on said detector means in Poisson distribution, and said pulses having width t.sub.DS ;
- counting means, including clock pulse generator means for generating clock pulses independent of said pulses and having width t.sub.CLK which is larger than width t.sub.DS, for counting said clock pulses during an interval T when at least a part of said pulses exists in one cycle prior to a presently occurring cycle of said clock pulses, and producing a count R;
- and
- correcting means for correcting said count R to compensate for those pulses missed by said counting means and calculating a corrected count R' using the count R, clock width t.sub.CLK and interval T.
Dependencies are inferred from the claim text.