Amperex Model 120NB End Window GM (1950s, 1960s) |
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This rather large end window GM tube was manufactured by Amperex Electronic Corporation of Brooklyn New York. Its main purpose would have been to count beta particles - the window is sufficiently thick that it would not respond to alpha particles. I believe that the N in the model number refers to the use of a neon fill gas and that the B refers to the four pin base. Size: 5.75” long and 2.312” diameter Window: 1.906" effective diameter 5.6 mg/cm2 Operating Voltage: 900 volts Dead time: ca. 300 usec Cathode: stainless steel coated on outside with plastic. Gas: Neon, halogen quenched Base: four prong. |
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| Reference
Atomic Energy Commission Radiation Instrument Catalog, Date July 1, 1950, page BG-1A11A Amperex Nuclear Products catalog of radiation tubes. 1981. |
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