Radiation

Absorbed dose of ionizing radiation

microgray - µGy

milligray - mGy

centigray - cGy

rad

grey - Gy

Effective (equivalent) dose of ionizing radiation

microsievert - µSv

millirem

millisievert - mSv

rem

sievert - Sv

The exposure dose of radiation

microroentgen - µR

milliroentgen - mR

roentgen - R

Examples of radiation doses

hourly average background radiation

dental radiotherapy

Gastrointestinal X-ray investigation

Symptoms of radiation sickness

nausea and vomiting

weakness, fatigue

headache

fever

rash, bleeding, infection

diarrhea

leukopenia

death