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Geiger Counter Fun

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Answerprancer | 18:57 Sat 07th Nov 2015 | Science
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Has anyone here had any fun with one of these?
I bought one recently and did some exploring with it...

Background radiation where I live: average 0.1 microsieverts/hour

'vaseline glass' sugar bowl I have: 0.8 (the glass contains uranium oxide)

Background radiation on a recent flight at about 30,000ft: 4.0!

Takumar 50mm vintage camera lens: 24.0!! (the glass contains thorium)

Porst 55mm lens: 20.0 (thorium again)

Vintage mantle-clock with luminous hands/dial owned by me Mum: 7.0

Also I got a higher than normal background radiation result walking under an old red brick railway bridge recently - which was odd.
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Avatar Image jomifl
https://xkcd.com/radiation/

This puts radiation doses into perspective.
11:45 Fri 13th Nov 2015

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