<prompt> SI unit of radiation absorption:SievertGrayBecquerelRads  <response>: Ref: Internet SourcesExplanation:SI unit for Radiation absorption - Gray GyThe rad is a deprecated unit of absorbed radiation dose, defined as 1 rad 0.01 GyThe sievert Sv is the International System of Units SI derived unit of equivalent radiation dose, effective dose, and committed dose.The gray is used with quantities of absorbed dose in any material, while the sievert is used with equivalent, effective, and committed dose in biological tissue.Becquerel Bq - S I Unit of radioactivityThe Curie Ci is a non-SI unit of radioactivityRoentgen equivalent man or rem Symbol rem is a deprecated unit used to measure the biological effects of ionizing radiation.The rem is defined as equal to 0.01 sievert.The roentgen R, also rontgen is an obsolete unit of measurement for the kerma of X-rays and gamma rays up to 3 MeV.The rutherford symbol rd is an obsolete non SI unit of radioactivity. 