Recent Work on Photoemission and Dark Emission Problems

Journal Article · Mon Dec 01 04:00:00 EST 1958 · IRE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/TNS2.1958.4315640· OSTI ID:4306933

Engstrom, R. W.; Stoudenheimer, R. G.; Palmer, H. L.; Bly, D. A.

Recent developments have resulted in multiplier phototubes having wider spectrai responses from the ultraviolet to the infrared, having higher absolute sensitivity, and having lower dark emission. The multialkali photocathode discovered by Sommer is now being used in the development type multiplier phototube, C7237. Despite the very high red sensitivity of this cathode, the dark emission is a factor 10 lower than that of antimony-cesium cathodes used in typical scintillation counters. Output dark current is basically due to the photocathode dark emission, but this is sometimes increased by regenerative processes. In a special sixteen-stage developmental type with a sealedin optical shield, the dark current was kept to a minimum for gains as high as 10⁹ to 10¹⁰. Photocathodes of very high quantum efficiency have been achieved on the 7029 multiplier phototube type of means of an internally evaporated-front- surface photocathode of the antimony-cesium type. Absolute comparisons of special characteristics are presented for the photosensitive 6903 and for the 7102 multiplier phototube which has red and infrared sensitivity.

• Research Organization: RCA Electron Tube Div., Lancaster, Penna.
• Sponsoring Organization: USDOE
• NSA Number: NSA-13-003762
• OSTI ID: 4306933
• Journal Information: IRE Transactions on Nuclear Science, Journal Name: IRE Transactions on Nuclear Science Journal Issue: 3 Vol. 5; ISSN 0096-2015
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

42 ENGINEERING
ABSORPTION
ALKALI METALS
ANTIMONY
BACKGROUND
CATHODES
CESIUM
COMPOUND NUCLEI
CROSS SECTIONS
CURRENTS
DECAY
EFFICIENCY
EMISSION
ENERGY
ENERGY LEVELS
ENERGY RANGE
EVAPORATION
EXCITATION
GAMMA RADIATION
INFRARED RADIATION
MEASURED VALUES
MIXING
NUCLEAR REACTIONS
NUCLEI
OPERATION
OPTICAL SYSTEMS
PHOSPHORUS 31
PHOTOELECTRIC EFFECT
PHOTOMULTIPLIERS
PLANNING
PROTON BEAMS
RESONANCE
SCINTILLATION COUNTERS
SENSITIVITY
SPECTRA
SULFUR 32
SURFACES
ULTRAVIOLET RADIATION
USES
VAN DE GRAAFF ACCELERATORS