Radiant energy – Calibration or standardization methods
Patent
1990-06-22
1991-06-04
Hannaher, Constantine
Radiant energy
Calibration or standardization methods
25037001, 25037006, 250352, 250389, G01T 116, G01J 502
Patent
active
050216643
ABSTRACT:
A method and apparatus for correcting for the ballistic deficit effect that occurs when determining the spectra of radioactive substances with an ionizing radiation detector. Two pulses derived from each output pulse of the detector, each having different peaking times but both containing effects of the ballistic deficit, are compared to produce an error signal related to the difference of the peak heights of these two pulses. A part (or all) of the error signal is added to one of the pulses to produce a corrected amplitude pulse. In order to effectively compare the two pulses, each is separately stretched at its peak height. The corrected amplitude pulse is reformed for better handling by multichannel analyzer analog-to-digital converters, with a plurality of these reformed corrected amplitude pulses then being analyzed by the multichannel analyzer to achieve a nuclear spectra for which the ballistic deficit has been corrected. The two pulses that are created from the detector pulses can be of similar shape configuration, or can be different in shape. An example is given of a unipolar pulse and a bipolar pulse that is a derivative of the unipolar pulse. The method and apparatus is paramount when applied to the gamma ray spectra obtained from a germanium gamma ray detector.
REFERENCES:
patent: 3872287 (1975-03-01), Koeman
patent: 4937452 (1990-06-01), Simpson et al.
Piet Van Duppen, Paul Duhamel and Jean Vanhorenbeeck, "Timing Properties of a Lege'-Type (Low Energy Germanium) Detector", Nuclear Instruments and Methods in Physics Research, vol. A254, No. 2 (Feb. 15, 1987), pp. 401-405 [.COPYRGT. Elsevier Science Publishers B.V.].
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Billy W. Loo, Fred S. Goulding and Dexi Gao, "Ballistic Deficits in Pulse Shaping Amplifiers," Lawrence Berkley Laboratory, Calif., LBL-23356, {Note: This may correspond to a publication in IEEE Trans. Nucl. Sci., vol. NS-34 (1988), p. 114}.
F. S. Goulding and D. A. Landis, "Ballistic Deficit Correction in Semiconductor Detector Spectrometers, "Lawrence Berkley Laboratory, Calif., LBL-22195, {Note: This may correspond to a publication in IEEE Trans. Nucl. Sci., vol. NS-34 (1987), p. 119}.
M. L. Simpson, T. W. Raudorf, T. J. Paulus and R. C. Trammell, "Charge Trapping Correction in Ge Spectrometers," EG&G Ortec, Tennessee, {Applicant has not provided a source or date for this document}.
Eisenberg Jacob M.
Hannaher Constantine
Tennelec/Nucleus Inc.
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