Activity Conversion Amount Unit < - > Amount Unit Tera Giga Mega Kilo Milli Micro Nano Pico Bequerel Curies - - Tera Giga Mega Kilo Milli Micro Nano Pico Bq/Curies < - > Curies/Bq 1Ci = 3.7 x 1010Bq 1Bq = 1 Bequerel = 1 dps (disintegration per second) 1cps = 1 count per second = 1 dpm/60 Dose Conversion Quality Factor Amount Unit < - > Amount Unit Tera Giga Mega Kilo Milli Micro Nano Pico Gray Sieverts - - Tera Giga Mega Kilo Milli Micro Nano Pico 7.5 mrem = 75microSv Unit of Dose Equivalent - Sieverts (Sv) formerly rem Unit of Absorbed Dose - Gray (Gy) formerly rad 1 Gy = 1 Joule/Kg Gy x QF (quality factor) = Sv Decay Correction Nuclide Known Activity Known Activity Date <-> New Date Calculated Activity Please select Am-241 Am-243 Au-198 Ba-133 C-14 Ca-45 Cd-109 Cd-113m Ce-139 Ce-144 Cl-36 Co-57 Co-60 Cr-51 Cs-134 Cs-137 Eu-152 Eu-154 Eu-155 Fe-55 Fe-59 H-3 Hg-203 I-125 I-129 I-131 Mn-54 Na-22 Nat U Nb-95 Ni-63 Np-237 P-32 P-33 Pb-210 Pm-147 Po-208 Po-209 Po-210 Pu-238 - Tera Giga Mega Kilo Milli Micro Nano Pico Bq - - Tera Giga Mega Kilo Milli Micro Nano Pico Bq Table of Nuclides   Unit Prefix T Tera = 1012 G Giga = 109 M Mega = 106 K Kilo = 103 m milli = 10-3 µ micro = 10-6 n nano = 10-9 p pico = 10-12 Examples of Quality Factors Xray, Gamma & Beta 1 Protons 2 Neutrons 2.5 to 20 Alpha, Multiple Charged Particle 20