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very high voltage photos and other cool stuff

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http://www.capturedlightning.com/frames/lichtenbergs.html

http://www.capturedlightning.com/frames/Z02A.jpg

Common table salt (NaCl) is also thermoluminescent. However, unlike 
calcite, it doesn't glow at room temperature. When irradiated with 
high-energy electrons, NaCl changes to a cinnamon color due to the 
trapping of electrons in defects in the crystal structure. Called 
F-Centers, these are vacancies inside the crystalline lattice of the 
salt crystals. Irradiated salt will remain this color as long as it is 
kept cool, dry, and protected from UV light. When the irradiated salt 
crystals are dropped onto a hotplate, each emits a brilliant green flash 
as it changes back to its normal (clear/white) color as can be seen in 
this short video clip by high school instructor Gary Bodman 
(Albuquerque, NM).


several radiation photos of materials too.

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very high voltage photos and other cool stuff Serg io <invalid@invalid.com> - 2017-08-05 23:23 -0500
  Re: very high voltage photos and other cool stuff "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-08-06 11:26 -0700
    Re: very high voltage photos and other cool stuff john <johnsefton288@gmail.com> - 2017-08-06 17:16 -0700
      Re: very high voltage photos and other cool stuff john <johnsefton288@gmail.com> - 2017-08-06 18:04 -0700
    Re: very high voltage photos and other cool stuff "hanson" <hanson@quick.net> - 2017-08-06 22:40 -0700
  Re: very high voltage photos and other cool stuff benj <benj@nobody.net> - 2017-08-07 17:26 -0400
    Re: very high voltage photos and other cool stuff Serg io <invalid@invalid.com> - 2017-08-08 12:53 -0500

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