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level: Uses of UV energy in gemmology

Questions and Answers List

level questions: Uses of UV energy in gemmology

Question	Answer
Where does ultraviolet energy measure on the electromagnetic spectrum?	10 - 400nm
What two energy levels of UV light are primnarily used in gem testing?	Long wave (365nm)
What should you not do when using UV light during gem testing?	Look at it directly
What is the safest way to use UV light to avoid contact with skin and direct contact with eyes?	A viewing cabinet
What sort of background should gem material be placed on when viewing under UV light?	Black
What is the name of the tool used to measure emission or absorption positions in gemstones, and their relative intensities across various ranges of radiation energy?	Spectrometers
What is the terms used to describe the type of energy that has shorter wavelengths and higher energy than UV radiation?	X-Ray
What three types of testing are X-ray machines commonly used for in gemmology?	Diamonds against visual simulants
What type of radiation has a wavelength longer than that of visible light, but shorter than microwaves?	Infrared
What is the name of the tool used to measure absorption in gem materials through the infrared part of the electromagnetic spectrum?	Infrared Spectrometer
What is the name of the tool that uses infrared energy to detect the reflecting power of the surface of a gemstone?	Reflectance meter
What is the name for the small amount of energy re-emitted at a different energy level from a stong beam of absorbed energy by a gemstone?	Raman Spectrum
What is the name of a tool that used an elctron beam to stimulate visible light flourescence, and can be used to reveal internal features of gems that would be otherwise undetectable?	Cathodoluminescence