References <measurement unit>

Sv (Sievert): Unit to show a degree of effect when a human body is exposed to Radiation

Bq (Becquerel): Unit to show radioactivity.1 Bq means one radioactive disintegrationper second.

Gy (Gray): a dose of radiation energy absorbed in the substance hit by radiation.1Gy means that 1 Joule of energy is absorbed in a substance of 1Kg.