Method and arrangement for the automatic stabilization of a scin

Details Method and arrangement for the automatic stabilization of a scin Method and arrangement for the automatic stabilization of a scin

1984-08-01

1986-09-09

Fields, Carolyn E.

Radiant energy

Calibration or standardization methods

250369, G01T 120

Patent

active

046111174

ABSTRACT:
A plastic scintillation detector (14) generates on the basis of ionizing radiation coming from a radiation source (16) light flashes which are converted by a photoelectric transducer (20), for example a photoelectron multiplier, to electrical output pulses. An evaluation circuit (22) counts the output pulses as a measure of the radiation intensity. For automatic stabilization of the scintillation detector a light source (24) is controlled by a driving circuit (26) in such a manner that it transmits light pulses whose intensity is modulated in accordance with a predetermined periodic function, for example a sawtooth function. The modulated light pulses are also intercepted by the photoelectric transducer (20) and converted by the latter into electrical reference pulses. A monitoring circuit (28) determines in each modulation period the number of reference pulses whose amplitude exceeds a predetermined reference threshold value lying in the modulation interval. The pulse number determined is used to stabilize the scintillation detector, either by controlling the amplification in the sense of maintaining a predetermined pulse number or by corresponding correction of the measurement result furnished by the evaluation circuit.

REFERENCES:
patent: 3179801 (1965-04-01), Scherbatskoy
patent: 3428804 (1969-02-01), Comunnetti
K. G. A. Porges, "The Performance of a Light-Pulser-Operated Digital Stabilizer", Nuclear Instruments and Methods, 124, (1975), pp. 235-241.
R. Martincic, V. Ivkovic and M. Tiringer, "A System for Stabilizing the Gain of a Scintillation Spectrometer Using a Light-Emitting Diode and a Processor in Feedback", Nuclear Instruments and Methods, 147, (1977), pp. 513-518.

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