<prompt> S.I Unit of radioactivity isBecquerelCurieGraySieve  <response>: UNITS OF RADIATION Physical quantity S.I. Unit Non S.I. Unit Conversion Radioactivity Becqueral Bq Curie Ci 1 Ci 3.7 X 1010 Bq Absorbed dose Gray Gy Rad 1 Gy 100 rads 1 rad 0.01 gy Dose equivalent Sieve SV Rem 1 SV 100 rem 1 Rem 0.01 Sv Exposure coulombkg Roentgen 1R 2.58 x 10-4coulombkg of air 