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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.