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Homemade Geiger counter - radioactive lantern mantles

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Uploaded on Mar 21, 2010

An improved version the counter of the previous video:
-New high voltage power supply and detector circuit based
on Charles Wenzel from
http://www.techlib.com/science/geiger...
-External probe for more practical use "in the field" and prospecting
-New beeper
-The probe can be use to measure gamma or beta+gamma by just rotating it.

In this vid I check two lantern mantles, one from Argentina, and one made in Indonesia, both "highly" radioactive by the Thorium (and decay products) in it.
The CPM value on the meter are not accurate since I moved the probe during measuring period.

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