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/ˈsiː.vət/ · noun
In the International System of Units, the derived unit of radiation dose: the dose received in one hour at a distance of 1 cm from a point source of 1 mg of radium in a 0.5 mm thick platinum enclosure, which in its biological effects corresponds to several different quantities: equivalent dose, effective dose, and committed dose..
Use sievert when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sievert means In the International System of Units, the derived unit of radiation dose: the dose received in one hour at a distance of 1 cm from a point source of 1 mg of radium in a 0.5 mm thick platinum enclosure, which in its biological effects corresponds to several different quantities: equivalent dose, effective dose, and committed dose..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use sievert where its definition matches the intended context.
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