Validating minting ages of coins

XRD can be used to validate minting ages of coins. A 2005 US penny has a zinc metal core and a combination Cu/Nickel alloy coating. Before 1986, the US pennies were comprised entirely of a copper and zinc alloy. When looking at the diffraction patterns from a MiniFlex in the figures it can be seen that no zinc core was discovered in the 1985 penny.

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The fifth generation MiniFlex is a general purpose X-ray diffractometer that can perform qualitative and quantitative analysis of polycrystalline materials. The MiniFlex is available in two variations. Operating at 600 watts (X-ray tube), the MiniFlex 600 is twice as powerful as other benchtop models, enabling faster analysis and improved overall throughput. Running at 300 watts (X-ray tube), the new MiniFlex 300 does not require an external heat exchanger. Each model is engineered to maximize flexibility in a benchtop package. Read more...

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