Patent Number: 
Section: claims

1. A method of preparing high-specific-activity  195m Pt comprising the steps of: a. exposing  193 Ir to a flux of neutrons sufficient to convert a portion of said  193 Ir to  195m Pt to form an irradiated material;  b. dissolving said irradiated material to form an intermediate solution comprising Ir and Pt; and  c. separating said Pt from said Ir by cation exchange chromatography to produce a product comprising  195m Pt. 2. A method in accordance with  claim 1  wherein said dissolving step is carried out at a temperature of at least 210xc2x0 C. claim 1 3. A method in accordance with  claim 2  wherein said dissolving step is carried out at a temperature of at least 217xc2x0 C. claim 2 4. A method in accordance with  claim 1  wherein said intermediate solution further comprises aqua regia. claim 1 5. A method in accordance with  claim 1  wherein said separating step further comprises the steps of: claim 1 a. loading said intermediate solution onto a cation exchange column;  b. eluting said Pt with a first eluent solution comprising HCl and thiourea.  c. eluting said Pt with an essentially thiourea-free second eluent solution comprising HCl. 6. A method in accordance with  claim 1  wherein said  195m Pt product is characterized by a specific activity of at least 30 mCi/mg Pt. claim 1 7. A method in accordance with  claim 6  wherein said  195m Pt product is further characterized by a specific activity of at least 50 mCi/mg Pt. claim 6 8. A method in accordance with  claim 7  wherein said  195m Pt product is further characterized by a specific activity of at least 70 mCi/mg Pt. claim 7 9. A method in accordance with  claim 8  wherein said  195m Pt product is further characterized by a specific activity of at least 90 mCi/mg Pt. claim 8