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#7
04-10-2017, 08:06 PM
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The cathodes didn't use Cesium, AFAIK. The cathode in most tubes is a high purity nickel structure coated with an active layer of barium and strontium (and sometimes calcium) carbonates. During exhaust, the cathode is heated, converting the carbonates to their corresponding oxides.
Cesium was occasionally used as a getter material in some tubes, and it is used as part of the photocathode in some camera tubes, phototubes, etc. 
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