Luminescence is spontaneous emission of light by a substance not resulting from heat; or "cold light". It is thus a form of cold-body radiation. It can be caused by chemical reactions , electrical energy , subatomic motions or stress on a crystal. This distinguishes luminescence from incandescence , which is light emitted by a substance as a result of heating. Historically, radioactivity was thought of as a form of "radio-luminescence", although it is today considered to be separate since it involves more than electromagnetic radiation.
Luminescence - Wikipedia
Thermoluminescence dating example. Scientists in North America first developed thermoluminescence dating of rock minerals in the s and s, and the University of Oxford, England first developed the thermoluminescence dating of fired ceramics in the s and s. During the s and s scientists at Simon Frasier University, Canada, developed standard thermoluminescence dating procedures used to date sediments. In , they also developed optically stimulated luminescence dating techniques, which use laser light, to date sediments. The microscopic structure of some minerals and ceramics trap nuclear radioactive energy. This energy is in constant motion within the minerals or sherds.
It was a great success and we are planning to roll out more online events until it is safe for the real story cafes to take place again. We are very grateful to Cornwall Community Foundation who helped to fund our virtual story cafes. We will be adding the recordings of all the story cafes onto this page, please keep checking after each event for the video links. We know that some other organisations are also running online events, so we thought it would be a great idea to share these on our website as well. If you are an organisation and would like to add your events to this page, please get in touch!
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