Dead time compensation circuit

Details Dead time compensation circuit Dead time compensation circuit

1981-02-23

1983-12-06

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250388, H01J 4708

Patent

active

044195796

ABSTRACT:
This invention relates to a dead time compensation circuit for a radiation detector using a Geiger-Muller tube. The Geiger-Muller tube is the most commonly used detector for measuring gamma radiation. However, they have a restricted linear range which makes it difficult to use them with digital numeric displays. The highest dose rate that can be measured is limited by the tube dead time, i.e. the interval after the initiation of a pulse during which a subsequent ionizing event does not produce a pulse. The present invention adds one or more pulses to the display counter when the Geiger-Muller tube provides two or more pulses in a given time interval (t). The dose rate or count rate is sampled at the beginning of each counting period (T) and the interval t is made proportional to the count rate. At low count rates, where dead time losses are negligible, no pulses are added. At high count rates, where t can be several times the tube dead time, counting losses of 50% can be compensated.

REFERENCES:
patent: 3814937 (1974-06-01), Lowes

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