[Lab] UV measurement

Emily Daniels emily.daniels at gmail.com
Fri May 18 17:25:05 EDT 2012

Thanks guys-

So I added Magnesium Carbonate (climber's chalk) as the fluorescent
substance and from what I could find Magnesite is the most common form
which does fluoresce, phosporesce and occasionally triboluminesce. The
climber's chalk did not state it was from Magnesite, but "an athletic grade
of natural carbonate of magnesia" with no additives.

I added this to the piezoelectric salt mixture that I used in a previous
experiment and when it sets I'll hook it up to some electricity and see
what happens. I had a terrible time trying to locate other fluorescent
materials around town- I was close to using baby powder at one point (Talc
fluoresces) but chickened out due to the unknown "parfum" factor. If it
doesn't work it's ok, but it would be neat to see if the piezoelectric salt
is producing some kind of UV radiation.


On Fri, May 18, 2012 at 5:11 PM, Michael Ayukawa <mike.ayukawa at gmail.com>wrote:

> To just confirm you have a UV source I'd just start with one of these
> minerals:
> http://en.wikipedia.org/wiki/File:Fluorescent_minerals_hg.jpg
> Looks like calcite is on the list.  So go find some chips of white marble
> from
> a gardening store or borrow some from a potted plant.
> http://www1.newark.ohio-state.edu/Professional/OSU/Faculty/jstjohn/Zinc%20ore/Franklin-Marble.htm
> /Mike
> On 2012-05-18, at 5:02 PM, Paul & Andrea Mumby wrote:
> Something like this will detect UV, but it's an on/off type sensor (no
> "measurement")
> http://www.seeedstudio.com/depot/uv-tron-driver-circuit-c10807-p-640.html?cPath=6
> Certain types of phosphors will convert UV to visible light.
> Also there are photosensitive papers that will react to UV (turning from
> black to white when exposed to UV for example)
> such as:
> http://www.onlinesciencemall.com/sunart-paper-8x10-uv-sensitive-rayograph-paper-kit.html
> Hope that helps :)
> - Paul
> On Fri, May 18, 2012 at 4:55 PM, Emily Daniels <emily.daniels at gmail.com>wrote:
>> Hi Labbers,
>> I may have already asked this group but does anyone have a way/device to
>> measure ultraviolet (UVA/UVB/UVC) radiation and intensity/wavelengths? I
>> may have just made something that gives off UV light but I'm not entirely
>> sure. Any suggestions?
>> Emily
>> --
>> Emily Daniels | emilydaniels.com | @emdaniels | awesomefoundation.org
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Emily Daniels | emilydaniels.com | @emdaniels | awesomefoundation.org
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