The sievert (symbol: Sv) is the SI derived unit of dose equivalent.


It attempts to reflect the biological effects of radiation as opposed to the physical aspects, which are characterised by the absorbed dose, measured in gray.

How measuredEdit

The equivalent dose to a tissue is found by multiplying the absorbed dose, in grays, by a dimensionless "quality factor" Q, dependent upon radiation type, and by another dimensionless factor N, dependent on all other pertinent factors.


In terms of SI base units:

1 Sv = 1 J/kg = 1

SI multiples and conversions Edit

Frequently used SI multiples are the millisievert (1 mSv = 10–3 Sv) and microsievert (1 µSv = 10–6 Sv).

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