Victoreen Model VG 10A End Window GM Tubes (ca. late 1940s) |
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The Model VG 10A end window GM detector was manufactured by the Victoreen
Instrument Company of Cleveland Ohio. Like most end window
GMs, it was designed for measuring the beta activity in samples that were
often held in planchets positioned below the detector window. While these
tubes also responded to gamma rays, their gamma efficiency was comparatively
poor.
Of the two pictured here, only the one on the left has a label identifying it as the Model 10A. The other, which has no label or identification marks, is identical except for two things: it doesn't have a brass cap, and the window has a reflective coating (aluminum/steel?). This coating was probably used to prevent light from penetrating the thin mica window - the standard VG 10 tubes were photosensitive. |
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Size: 4 1/4" long, 2 1/4" diameter Window: mica, 1 1/8" diameter, 2.9 mg/cm2 Operating voltage: 1200 volts Gas: argon with 8% organic vapor at 120 mm Hg |
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Reference AEC Radiation Instrument
Catalog, page date Nucleonics April 1948, page 85 Donated by Ron Kathren |
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