Simplify the following text for a Grade 11 native English-speaking person.
Original: The International Atomic Energy Agency ( IAEA ) announced on 27 March that workers hospitalized as a precaution on 25 March had been exposed to between 2 and 6 Sv of radiation at their ankles when standing in water in unit 3 .
Simplified: Two workers hospitalized as a precaution on 25 March had been exposed to between 2000 and 6000 mSv of radiation at their ankles when standing in water in unit 3 .