The early risk of internal contaminated accumulation of ¹⁴⁷Pm is in blood cells and endothelial cells, especially in red blood cells. Then ¹⁴⁷Pm is selectively deposited in ultrastructure of liver cells, such as in nucleus, nucleolus, rough endoplasmic reticulum, mitochondria and microbodies. Dense tracks also appear in mitochondria and lysosome of pedal cells within renal corpuscle, and so does in nucleus as well as in mitochondria and microbodies of epicyte of kidney near-convoluted tubule. With the prolongation of observing time, ¹⁴⁷Pm is selectively and steadily deposited in subcellular level of organic component for bone. Substantial amount of ¹⁴⁷Pm is taken up into the nuclear fraction of osteoclasts and osteoblasts. Particularly, in organelles ¹⁴⁷Pm is mainly accumulated in rough endoplasmic reticulum and in mitochondria. Autoradiographic tracks especially localize in combined point between Golgi complex and transitive vesicle of rough endoplasmic reticulum. In addition, numerous ¹⁴⁷Pm deposited in collagenous fibre within interstitial of bone cells is hardly excreted.