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A prototype gas-filled proportional counter (PC) based on micro-scale tungsten wire and carbon fiber, and nano-scale carbon nanotube (CNT) anodes was built and tested with a 90 Sr source. Tungsten anodes of 500μm down to 4μm diameter were used to observe the gradual decrease in operating voltage for the proportional region with a decreasing anode diameter. The 40nm diameter CNTs anodes ranged...
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