Method and apparatus for the automatic stabilization of drift in

Details Method and apparatus for the automatic stabilization of drift in Method and apparatus for the automatic stabilization of drift in

1979-06-12

1981-06-09

Willis, Davis L.

Radiant energy

Calibration or standardization methods

250369, 250386, G01D 1800

Patent

active

042726778

ABSTRACT:
A method and apparatus for automatically stabilizing drift in radiation measurements which employ a detector whose pulse amplitude corresponds to the energy absorbed by the detector, involves the use of a peak produced in the pulse amplitude spectrum by individual electrons. The peak is at the low energy end of the spectrum and is drift stable. It can be produced by for example a direct or indirect light source such as a light emitting diode, by the phosphorescence of e.g. a sodium iodide crystal used as a scintillation crystal in nuclear radiation measurement, or by spontaneous surface emission within the detector, which is suitably a photomultiplier. The apparatus includes a determination device to determine the position of the drift stable peak and a control device to control the detector in response to the output of the determination device.

REFERENCES:
patent: 3179801 (1965-04-01), Scherbatskoy
patent: 3270205 (1966-08-01), Ladd et al.
patent: 3337737 (1967-08-01), Eberhardt
patent: 3953736 (1976-04-01), Kubisiak et al.
patent: 4079257 (1978-03-01), Jatteau et al.
Ascoli, "Su un Dispositivo per la Stabilizzazione dei Fotomoltiplicatori", Il Nuovo Cimento, vol. IX, No. 7, 1952, pp. 615-617.
de Waard, "Stabilizing Scintillation Spectrometers with Counting Rate Difference Feedback", Nucleonics, vol. 13, No. 7, Jul. 1955, pp. 36-41.
Haun et al, Nuclear Instruments and Methods, vol. 8, No. 3, 1960, pp. 331-338.
Soini, Review of Scientific Instruments, vol. 46, No. 8, Aug. 1975, pp. 980-984.

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