Patent Number: 
Section: claims

1. A composition of matter comprising  195m Pt characterized by a specific activity of at least 30 mCi/mg Pt. 2. A composition of matter in accordance with  claim 1  further characterized by a specific activity of at least 50 mCi/mg Pt. claim 1 3. A composition of matter in accordance with  claim 2  further characterized by a specific activity of at least 70 mCi/mg Pt. claim 2 4. A composition of matter in accordance with  claim 3  further characterized by a specific activity of at least 90 mCi/mg Pt. claim 3 5. High-specific-activity  195m Pt made by a method 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. 6. High-specific-activity  195m Pt in accordance with  claim 5  wherein said dissolving step is carried out at a temperature of at least 210xc2x0 C. claim 5 7. High-specific-activity  195m Pt in accordance with  claim 6  wherein said dissolving step is carried out at a temperature of at least 217xc2x0 C. claim 6 8. High-specific-activity  195m Pt in accordance with  claim 5  wherein said intermediate solution further comprises aqua regia. claim 5 9. High-specific-activity  195m Pt in accordance with  claim 5  wherein said separating step further comprises the steps of: claim 5 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. 10. High-specific-activity  195m Pt in accordance with  claim 5  wherein said  195m Pt product is characterized by a specific activity of at least 30 mCi/mg Pt. claim 5 11. High-specific-activity  195m Pt in accordance with  claim 10  wherein said  195m Pt product is further characterized by a specific activity of at least 50 mCi/mg Pt. claim 10 12. High-specific-activity  195m Pt in accordance with  claim 11  wherein said  195m Pt product is further characterized by a specific activity of at least 70 mCi/mg Pt. claim 11 13. High-specific-activity  195m Pt in accordance with  claim 12  wherein said  195m Pt product is further characterized by a specific activity of at least 90 mCi/mg Pt. claim 12