I'm sharing this fun app because I think it's quite smart
Radioactivity Counter (by Rolf-Dieter Klein)
It's not very sensitive and it's slow, but nothing is required besides dowloading the app (for a few bucks) and taping a thin piece of opaque material over your phone's camera.
Post subject: Re: Geiger counter app for smartphones
Posted: Mon Aug 15, 2022 12:54 pm
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Joined: Sun Jun 28, 2009 9:56 am Posts: 1284
Some crystals (organic or inorganic) are known to exhibit luminescence ("scintillate") when exposed to ionizing radiation, and are thus called scintillator crystals. Such crystals are notably used in radiation detection devices known as scintillation counters. The luminescent screens in spinthariscopes are also sprinkled with similar compounds.
They're hyperfluorescent, and though they're often used to detect x-rays or gamma rays they will often also react to UV or even visible light, giving you cool glowing materials. Ce:YAG is a classic example but there are others. A lot of the synthetic gems I sell are industrial scintillator offcuts (LuAG, GAGG and LYSO). So it might be possible to polish up a thin wafer of one and put one right in front of the camera to enhance that response by converting invisible radiation to visible.
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