Sievert (Sv):
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Sievert is the unit of radiation absorption in the International System of Units (SI).
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The sievert takes into account the relative biological effectiveness of ionizing radiation.
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When the physical energy absorbed by tissues from x-rays, gamma rays or electrons is one Joule/kg, the biologically effective dose is considered to be one Sv.
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Since Sv is a huge unit, specialists use milliSv or “mSv”(one-thousandth of an Sv) as a unit.
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Skin dose in a chest x-ray exam is about 1 mSv.