Abstract: THE PREPARATION AND BIOLOGICAL EvALUATION OF A POTENTIAL TUMOR THERAPEUTIC~(103)，~(109)PdRADIOCOLLOIDLiu Zhonglin；Luo Shunzhong（southwest Institute of Nuclear Physics and chemistry，chengdu 610003）Dai Ting'en（General Hospital of kunming Military Region,650000）ABSTRACT The~(103)，~(109)pd radiocolloid is obtained after treating irradiated metallic palladium powder in reactorwith nitric acid and hydrochloric acid in the presence of ascorbic acid（reducing agent）as well as glu-cose and gelatin（protectiue agent）．The size of Pd radiocolloid particles is in the range of 1 5 0一400nm. Animal tests indicated that the~(103).~(109)pd colloid can be concentrated highly into the tumor of rab-bits． No toxic effect is observed when the~(103),~(109)pd radiocolloid is injected into a rat in a dose as muchas 1 00 times of that for a patient（1.
2GBq／50 kg）. Key words ~(103)，~(109)pd radiocolloid tumor bio-evaluation