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  • Indytim22 commented on mosivers's instructable Fluorescent Crystal Display Stand7 months ago
    Fluorescent Crystal Display Stand

    First of all, thanks for sharing this display. I'm extremely envious of both your CaWO4 crystal sample and 278nm UVC LEDs. Those are unobtainable for just about anybody outside of exotic physics research. You're lucky to walk away with those samples. I'm curious about a few aspects of this display piece. What other kinds of radiation sources will cause CaWO4 to scintillate? The piece you have is probably worth a fortune if it can detect and resolve gamma or beta spectra when coupled to an appropriately designed photo-multiplier tube or a sensitive photo-diode based photodetector. Since Tungsten is so dense, you probably wouldn't need much of it to make a nice portable scintillation detector or gamma spectrometer. With a secondary scintillation screen and a fiber-optic micro-chan...

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    First of all, thanks for sharing this display. I'm extremely envious of both your CaWO4 crystal sample and 278nm UVC LEDs. Those are unobtainable for just about anybody outside of exotic physics research. You're lucky to walk away with those samples. I'm curious about a few aspects of this display piece. What other kinds of radiation sources will cause CaWO4 to scintillate? The piece you have is probably worth a fortune if it can detect and resolve gamma or beta spectra when coupled to an appropriately designed photo-multiplier tube or a sensitive photo-diode based photodetector. Since Tungsten is so dense, you probably wouldn't need much of it to make a nice portable scintillation detector or gamma spectrometer. With a secondary scintillation screen and a fiber-optic micro-channel plate, you could close couple this crystal to a CCD camera for radiation imaging. I have a quantity of fiber-optic micro-channel plates about 6-7mm thick and 40mm square if you want to make a trade for a slice of your crystal. My plates would need to be polished, but so would a slice of the CaWO4 crystal, so some finishing work would be needed. I also have plates that are pre-polished into a Plano-convex configuration.The other thing that stands out to me is the UVC light source. Does the CaWO4 absorb all of it? If not, may I suggest a glass shield around the whole display to at least block the stray UVC and UVB rays from a casual observer. I'm also wondering if these UVC LEDs create any ozone in open air?

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