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Old 21st Nov 2022, 4:30 pm   #3
PaulDarzi
Tetrode
 
Join Date: Nov 2022
Location: Near Worcestershire/Gloucestershire border (in WR), UK.
Posts: 70
Default Re: Contamination Meter No. 1 no reading

Recent Tilley mantles have little or no Thorium - you need old stock for the Thorium doped versions 1970's or older IIRC.

You may have better luck if you have (or can borrow) old pocket watch or pre 1950's wrist watches with lumious marks - they are usually super emitters especially the Radium based paints.
Sometimes a trawl around second hand shops can turn up either suitable watches or alternatively "uranium glass" ware https://en.wikipedia.org/wiki/Uranium_glass aka Vaseline glass - which are great test sources.
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