The Sievert, abbreviated Sv is the SI unit to measure the equivalent dose and commited dose of ionizing radiation, which represent the risk of bodily radiation dosage and harm as a result of it. It looks at how an organism reacts to a given dose. This is different from measuring the total absorbed dose, which is measured in grays. This unit is important in [radiation protection] and medical treatments such as [radiotherapy]. It is named after Rolf Sievert, a Swedish physicist and doctor, who did research on how radiation affects organisms.

v t e SI units
Authority: International System of Units (BIPM)
Base units	ampere candela kelvin kilogram metre mole second
Units based on other units	becquerel coulomb degree Celsius farad gray henry hertz joule katal lumen lux newton ohm pascal radian siemens sievert steradian tesla volt watt weber
Other SI units	astronomical unit bar dalton day decibel degree of arc electronvolt hectare hour litre minute minute of arc neper second of arc tonne atomic units natural units
See also	Conversion of units Metric prefixes Systems of measurement
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