Method for stabilizing the anode sensitivity of a photomultiplie

Details Method for stabilizing the anode sensitivity of a photomultiplie Method for stabilizing the anode sensitivity of a photomultiplie

1980-06-30

1982-07-27

Weidenfeld, Gil

H01J 912, H01J 900

Patent

active

043414273

ABSTRACT:
A method is described for stabilizing the anode sensitivity of a photomultiplier tube having a photocathode, an anode, and a plurality of dynodes including at least one Nichrome dynode adjacent to the anode. The steps include differentially heating the tube so that the temperature of the Nichrome dynodes and the anode is substantially greater than the photocathode. The temperature gradient established by the differential heating redistributes alkali material from the surface of the dynodes in a beneficial manner so as to balance the secondary emission gain of the dynodes so that decrease in Nichrome dynode gain is offset by increases in the gain of the other dynodes. The tube is then bright aged at a first voltage followed by a dark age at a higher voltage. The aging steps rearrange or rebind the remaining loosely bound alkali material to provide an increase in anode sensitivity stability.

REFERENCES:
patent: 2237242 (1941-04-01), Tykociner et al.
patent: 2676282 (1954-04-01), Polkosky
patent: 2952499 (1960-09-01), Carson
patent: 3251640 (1966-05-01), Wennin
patent: 3535011 (1970-10-01), Matheson et al.
patent: 3649868 (1972-03-01), Bensussan
patent: 3966287 (1976-06-01), Liller
patent: 4099079 (1978-07-01), Knapp
RCA Photomultiplier Manual, PT61, p. 43, 1970.

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