A PICOCURIE (pCi) is a unit for measuring radioactivity, often expressed as picocuries per liter (pCi/L) of air.

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Other /More definition:
A PicoCurie (pCi) is One pCi is one trillionth of a Curie, 0.037 disintegrations per second, or 2.22 disintegrations per minute.

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Other /More definition:
A picocurie (pCi) is One one-trillionth (1/1,000,000,000,000) of a curie.

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Other /More definition:
A PICOCURIE (pCi) is a unit for measuring radioactivity, often expressed as picocuries per liter (pCi/L) of air.