Beta backscatter coating thickness gauge
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Description
An instrument permitting a quantitative measurement of the thickness of a coating (or a deposit) of a metal (or an alloy) on a different substrate (like silver on brass or copper, or gold on silver...). The principle of the measurement is based on the backscatter phenomenon of beta particles emitted by a sealed radioactive source like promethium 147, srontium-yttrium 90...) and detected by an appropriate detector. Such instrument can be be hand held or table top one. Such an instrument is of classical use in jewellery.
jauge d'épaisseur de depôt à rétrodiffusion bêta (Fr.);