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Not sure why, but the article doesn't have the original photos that went along with the post(s):

https://web.archive.org/web/20160919103031/http://blogs.scie...

https://web.archive.org/web/20150926005801/https://blogs.sci...

One thing I don't get: he is measuring gamma rays, which will go through the wall of the Geiger tube as easily as they'll go through the front window. Why does it matter how the tube is oriented with respect to the source? Seems like the only factor that should affect the count rate is distance.

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