 Geiger counter
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Tesladownunder
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Tue Apr 25 2006, 04:17AM
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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
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I've bee playing with a reasonably sensitive pancake style geiger counter recently. It has a 4.45 cm (1.75 inch) mica window. It is a GM-45 from Blackcat systems. Specifications include reading alpha radiation from 3 MeV (eg from a smoke detector), Beta radiation from 50 keV (eg from potassium) and gamma radiation (eg Uranium or x-rays down to 7 keV).
Background counts are around 50 CPM (counts per min)
Alpha from Americium 241 from smoke detector 80,000 CPM
Beta from Potassium Chloride 50% from the "reduced salt" version of table salt 238 CPM
Gamma from Uranium ore (Yellowcake) 108,000 CPM
Thoriated tungsten 564 CPM
Software also allows graphing and forwards by FTP directly to my site regularly.
Info and on my site here.
Peter
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