Antimony Posted July 10, 2015 Posted July 10, 2015 I'd like to use UV light to detect tungsten minerals (Scheelite, Wolframite) in rock samples. What UV light should I use?
StringJunky Posted July 10, 2015 Posted July 10, 2015 I have used fluorescent artificial fishing baits, charging them by shining my white LED headtorch very closely on them for a minute or two.
John Cuthber Posted July 10, 2015 Posted July 10, 2015 I have used fluorescent artificial fishing baits, charging them by shining my white LED headtorch very closely on them for a minute or two. How did you think that helped?* Generally, scheelite fluoresces under short wave UV Wolframite doesn't fluoresce. * Fluorescence is generally a very fast effect- a millisecond is a long fluorescence half-life- so if you needed to send a minute shining a torch on something, you were almost certainly not dealing with fluorescence. Even if you were not wrong about that, what did you think it had to do with the question?
StringJunky Posted July 11, 2015 Posted July 11, 2015 How did you think that helped?* Generally, scheelite fluoresces under short wave UV Wolframite doesn't fluoresce. * Fluorescence is generally a very fast effect- a millisecond is a long fluorescence half-life- so if you needed to send a minute shining a torch on something, you were almost certainly not dealing with fluorescence. Even if you were not wrong about that, what did you think it had to do with the question? LEDS emit UV. Cheap and easily available
John Cuthber Posted July 11, 2015 Posted July 11, 2015 LEDS emit UV. Cheap and easily available Oddly, you failed to mention those points in your first post.
StringJunky Posted July 11, 2015 Posted July 11, 2015 (edited) Oddly, you failed to mention those points in your first post. My apologies. Looking into it, I think your answer that shortwave is required is what he needs to know. The lights designed for that job seem reasonable enough price-wise...might as well get one of them. Edited July 11, 2015 by StringJunky
OptimisticCynic Posted August 9, 2015 Posted August 9, 2015 You might try a visible light trick. When you use a colored gel filter, of the correct color, the mineral you are looking for will stand out in comparison to the surrounding minerals. You would have to experiment with different colored filters to find one that works for what you want to do.
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