[en] Twenty rats were grouped into 4 groups, three of them were grouped according to the fraction of radium they have been ingested (0.133, 1 and 4 gr of radium with activity 5.75x10^-2 sec^-1 gr^-1), and the time interval between each fraction(daily, weekly and monthly) respectively. Rats are orally ingested by radium after they have been solved in water. Five rats were used as a control group. The treated and the control groups were than sacrificed after a period of 30 days. Liver, Kidney, brain, bone, gonads, lung were separated in addition to a 5 ml of blood sample taken on EDDTA. Organs were dried at 250 degree. Organs were subjected to autoradiographs technique using Cr-39 for one month. The density of track is counted under light microscope to determine the alpha activity of radium at each organ. Longitudinal sections of some organs were taken before drying to be studied pathologically to determine the extant of damage