For 75 mci, the usual initial mR/hour is 6-10 @ one meter.
I can't give a specific range but I can say the following. It really varies the "CPM" or mR/hour should be within safe limits but it also depends on the distance at which one measures. The actual #'s depend on his body mass and time from which the radionuclide was administered. It may also depend if there is any external contamination on clothes, skin.