Reducing gain shifts in photomultiplier tubes

Details Reducing gain shifts in photomultiplier tubes Reducing gain shifts in photomultiplier tubes

1974-10-24

1976-03-09

Mullins, James B.

Amplifiers

With secondary electron emission tube amplifying device

250207, H03F 100

Patent

active

039434583

ABSTRACT:
A means is provided for reducing gain shifts in multiplier tubes due to varying event count rates. It includes means for limiting the number of cascaded, active dynodes of the multiplier tube to a predetermined number with the last of predetermined number of dynodes being the output terminal of the tube. This output is applied to an amplifier to make up for the gain sacrificed by not totally utilizing all available active stages of the tube. Further reduction is obtained by illuminating the predetermined number of dynodes with a light source of such intensity that noise appearing at the output dynode associated with the illumination is negligible.

REFERENCES:
patent: 3015033 (1961-12-01), Muench
patent: 3614646 (1971-10-01), Hansen

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