concentrate in certain areas (bones, muscle) or organs (thyroid) are greatly feared, desnite the fact that the body does not take up all of the material available and that it also slowly eliminates some of the retained material little by little. The danger, ionizina asrect of the beta and gamma particles. of course, is due to the While even today the way by which these narticles influence bodily or cellular changes, it is known that continuous exvosure to sufficient quantities can produce bone tumors and leukemia in the case of strontium; the case of cesium; cancer and tumors in and tumors and cancer in the case of iodine. How these effects are initiated by ionizing radiation deserves to be outlined brieflv, before considering long-term effects. lO;4b26 “