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Detector, Solar Radiation, Magnetic Electron Multipier

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This object is on display in the Boeing Aviation Hangar at the Steven F. Udvar-Hazy Center.


Manufacturer: Bendix Corp.

Country of Origin: United States of America

Dimensions: Other: 3/16 in. diameter x 1 in. tall x 1 in. long x 3/4 in. wide (0.5 x 2.5 x 2.5 x 1.9cm)
Other: 2 1/2 in. diameter (6.4cm)

Materials: Block - metal Cathode - corrugated gold Tubes - metal

Bendix M306 Continuous Resistance Strip Electron Multiplier, an ultraviolet detector representative of those used on the OSO-F satellite. Utilizes an open cathode magnetic electron multiplier design that does not need to be enclosed in a glass or other insulating envelope since the vacuum required for its operation is supplied by the lack of atmosphere in Earth orbit. A UV photon striking the surface of the cathode at the entrance grid of the device results in the release of one or more electrons. The first of a series of permanent magnets then directs the emitted electrons onto a strip of specially coated glass. This results in the release of a large number of secondary electrons. Repetition of this process leads to a cascade of charge. The current gain can be as high as 10 million fold. The detector was transferred to NASM by NASA (GSFC) in 1988.

Transferred from the National Aeronautics and Space Administration

Inventory number: A19880226000

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