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Cold cathode gauges are costlier comparatively.
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Hot cathode gauges gets oxidised if oxygen is present. Also analyte gas may dissociate at high temperature.
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Alphatron ionization gauge provides cheap alternative in decomposable environment.
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Here an alpha particle emmiter is used to ionise the gas.The emmiter is positively-biased to collect negative ions which are generated by the impact of positively charged alpha-particle.
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The current generated is proportional to degree of vacuum inside gauge. A voltmeter measures voltage across resistor. It is also used as smoke detectors.
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Good Info. Keep going.
Good, brief, accurate & cool.