The following conversion factors relate these quantities
1 Ci = 3.7*10^10 dps.
1 rad = 1*10^-2 J/ kg tissue.
number of rems = (RBE)(number of rads).
Note that the conversion factors between curies and disintegrations per second and between rads and joules per kilogram of tissue are exact (i.e., they contain an infinite number of significant figures). The RBE, however, is approximate and has only one significant figure because it varies with the dose rate, total dose, and type of tissue affected.