Abstract
It has been shown that the metal on struck coin surfaces demonstrates residual elastic compression while the metal on cast coin surfaces demonstrates no stress at all or, sometimes, elastic tension. Non-destructive X-ray diffraction (XRD) (the so-called 'sin 2 Ψ method') is applied in this work for residual elastic stress analysis. It is quite an effective tool in the authentication of coins by establishing the production method of such objects (struck or cast).
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