Studies show that 235UO2F2 was chiefly localized in kidneys, then in skeleton and liver. Its radioactivity in skeleton rose steadily while the concentration in kidneys and liver droped. 235UO2F2 was difficult to pass through the blood- testes barrier. With 1 to 6 h contact period, only 1.4-1.6 % 235UO2F2 was found in the intact skin, but 41-54 % in the abrasive skin. The dynamic retention of 235UO2F2 through intact or abrasive skins was also dominantly localized in kidneys, skeleton and liver. Accumulation of insoluble 235U3O8 in gastrointestinal tract was well described by a double- exponential- term expression. Values of retention were estimated for fast component T1= 0.34 d, and for relatively long term component T2= 4.05 d.
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