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Fiestaware
#1
I'm sure many of you know about fiestaware. The uranium oxide glaze made fiestaware a radioactive product well into the 60's. Finally they changed the glaze to a non-radioactive type in 1972. Red is the most widely known as the most radioactive of the colors, bot other coloras can contain smaller amounts of uranium oxide also.

Here is a quick demonstration of a reading I captured with my gieger counter and a friends fiesta ware plate.

   

In conjunction with another common consumer product, the gamma and beta can be knocked down to almost background. And what is this magical consumer product?!? Original pyrex! Yes, pyrex is boronated glass (borosillicate) and the boron in the glass works to capture the energies being released by the radioisotopes. Only the old Pyrex has this effect. Old pyrex is clear and the new pyrex has a slightly blue tint. Here is the proof: Same plate, same geiger counter, with an old pyrex pie plate placed over the top.

   

I showed this trick to my friend so he could feel safe about keeping that plate in his house. It's interesting that before I took a measurement for him, he wasn't as concerned about it. After the meter started beeping and the reading just kept going up, suddenly he wasn't as keen about being close to it.
 
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#2
Thanks for showing the fiestaware. I hadn't thought of the original pyrex blocking radiation. I have bowls of the original pyrex, maybe I could use them as isolation chambers for testing. Some of the replacement pyrex was prone to explode in the oven, so I've held on to the old pyrex.
"The map is not the territory that it is a map of ... the word is not the thing being referred to."
 
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