Category Archives: Cameras

TOCPUG APRIL 4 GEIGER COUNTER RESULTS ~ Next Meeting May 2nd

FANTASTIC NIGHT!  Great turnout, and lots of vintage glass to scan!  

Based upon this article which mentions  vintage lenses from the 1930-70s containing Thorium: https://petapixel.com/2013/05/03/deca…

TOCPUG offered free geiger counting services on the night of April 4th. Attendees who brought in their vintage glass, could see if it was radioactive.

Here are the results. Keep in mind, Thorium is an alpha decaying radiation, not great to keep near the eyes, but generally safe to use.

Lots of internet discussion over “Thorium lenses”, this summates it nicely: https://www.reddit.com/r/askscience/c…

 

This chart also puts radiation in perspective: https://xkcd.com/radiation/