ITT Farnsworth Phototube Type FW-100
Photodétecteur de rayons gamma
Gamma-Detektor

These high current capacity phototubes were used for the measurement of high-density gamma radiation of short time duration.

The development of these tubes has been a cooperative project, initially between ITT Laboratories and Naval Research Laboratory, and since 1952, between ITT Laboratories and Edgerton, Germeshausen and Grier (EG&G).

The tubes are of coaxial design: the cathode and the anode are complete cylinders with a 2.25 dimensional ratio, corresponding to a characteristic impedance of 50 ohms. The output, without amplification, is normally fed directly into a 50-ohm coaxial transmision line to a traveling-wave oscilloscope for recording.

The tubes are normally used in conjunction with a plastic-type scintillator.

Several photocathodes have been tested: multialkali on reflective metal substrate, cesium-antimony on reflective metal substrate (S17), and cesium-antimony on metal substrate (S4).

Manufactured by • Fabriqué par • Hergestellt von : ITT Farnsworth Research Corp., Fort Wayne, Indiana.
Unfortunate circumstances caused Farnsworth to sell his company to ITT in 1949, and become a vice president of ITT Laboratories until his retirement in 1967.

Fiche technique • Data sheet • Datenblatt: FW-100.pdf

See also • Voir aussi • Siehe auch : Lawrence Berkeley Laboratory Phototube LBL 1994.47

Thanks to † Steve Shepard for providing data on these tubes.

 

From left to rigth: # 57-264, 58-354, 568, 58-364

Hauteur • Height • Höhe : 23 cm • 9" 1/10
Diamètre • Diameter • Durchmesser : 117 mm • 4" 6/10

Tests on this design indicated the need for capping the gauze anode to prevent electrical pickup.
As a result, the following model has been the standard for a number of years:

 

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