General Electric SRT-2 X-ray Tube (ca. 1950s) |
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| General Electric SRT-2. This is a hooded anode x-ray tube used for therapy (hence the "T"). The SR designation might stand for self-rectifying. The "2" indicates that this a fine to medium focus tube. The two projecting connections on the left end of the tube would seem to indicate that it was water-cooled. | |
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As seen in the photo to the right, the anode (target) is surrounded by a cylindrical copper hood. The latter plays several possible roles: it minimizes the number of stray electrons that impinge on the glass envelope, it shields stray x-rays, and it increases the heat capacity of the target. The x-ray beam escapes the hood through a square beryllium (?) window (facing upwards in the photo). The photo shows how the portion of the envelope adjacent to the port in the copper hood has been ground down in order to minimize the attenuation of the beam. |
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As seen in the photo to the right, a particularly interesting feature of
this tube is the fact that the cathode is a flat spiral coil similar to
that used in the early "Universal" x-ray tubes rather than the more common
"Benson" style coil. Size: approximately 19" long, 4.5" diameter (max)
Kindly donated by Margie Wheaton in memory of her father Dr. Julius E. Marfy |
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