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Does anyone in #Philly have a #radioactive source that produces X-ray/gamma or beta #radiation, or know where I can visit / borrow one?

I bought a geiger counter alternative on Kickstarter, and I have no idea if it works. I could buy radioactive test material, but then I would be intentionally creating the situation I am trying to avoid: radiation in my house.

So I want to find a gamma or beta radiation source not in my house, to test my radiation detector, but I don't want to keep it.