Tracerlab TGC-1 and TGC-2 End Window GM Tubes |
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The TGC-1 and TGC-2 are glass walled end window GM tubes designed for beta counting. They were the first GM tubes produced by Tracerlab, Inc. The earliest references I have for them are June 1948, while the last reference is 1958. TGC, as might be expected, stands for Tracerlab Geiger Counter. The key difference between the two tubes is that the TGC-1 has a 3-4 mg/cm2 mica window while the window of the TGC-2 is < 2 mg/cm2. Due to its thinner window, the TGC-2 was capable of alpha detection and had a better efficiency for low energy betas. Both employed helium as the fill gas together with an organic quench gas. |
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Size: 3.75” long and 1.5” inner diameter Window Thickness: TGC-1 3 – 4 mg/cm2 TGC-2 ca. 1.5 mg/cm2 Wall: glass, > 300 mg/cm2, aquadagged on inside Anode: Tungsten central wire. Operating voltage: 1400 V Plateau length: 300 volts Fill gas: helium Fill gas pressure: 720 mm Hg Dead time: ca. 200 us Base: four prong ceramic base: Price: TGC-1 $50 in 1948, $43.50 in 1952 TGC-2 $75 in 1948, $53.50 in 1952 Nucleonics
June 1948 p 80 Nucleonics
June 1948 p 103 AEC Radiation
Instrument Catalog, page date Tracerlog No.
Tracerlab Inc, Catalog E, March 1958 |
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