Becquerels and Sieverts
A becquerel (Bq), named after French physicist Henri Becquerel, is a measure of radioactivity
A quantity of radioactive material has an activity of 1Bq if one nucleus decays per second - and 1kBq if 1,000 nuclei decay per second
A sievert (Sv) is a measure of radiation absorbed by a person, named after Swedish medical physicist Rolf Sievert
A milli-sievert (mSv) is a 1,000th of a Sievert
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