Composition and methods of preparation of target material for producing radionuclides
A composition suitable for use as a target containing antimony to be irradiated by accelerated charged particles (e.g., by protons to produce tin-117m) comprises an intermetallic compound of antimony and titanium which is synthesized at high-temperature, for example, in an arc furnace. The formed material is powdered and melted in an induction furnace, or heated at high gas pressure in gas static camera. The obtained product has a density, temperature stability, and heat conductivity sufficient to provide an appropriate target material.
1. A method for producing a target material of an intermetallic compound of antimony and titanium for radionuclide production, the method comprising
(a) combining and melting elemental Ti and elemental Sb to form a TiSb alloy, and
(b) cooling and solidifying said TiSb alloy,
(c) wherein said TiSb alloy is ground to form a powder; and
(d) subsequently melting said TiSb alloy powder in an induction furnace at 1160-1500° C.
2. The method of claim 1 wherein the step of melting in the induction furnace is preformed at a pressure of 10 −2 torr or less.
3. The method of claim 1 wherein the step of melting in the induction furnace is performed in an inert gas with a purity no less than 99%.
4. The method of claim 1 wherein after melting in said induction furnace the melt is poured onto a pattern said pattern having a temperature of not more than 200° C.
5. A method for producing a target material of an intermetallic compound of antimony and titanium for radionuclide production the method comprising
combining and melting elements Ti and Sb to form a TiSb alloy,
cooling and solidifying said TiSb alloy,
wherein said TiSb alloy is ground to form a powder,
the powder is pressed and heated in said induction furnace while holding the pressed powder suspended in an magnetic field in said induction furnace to form a melt at 1160-1500° C., and
subsequently removing said magnetic field and pouring said melt into a pattern preheated to temperature not more than 200° C.
6. The method claimed in claim 1 wherein said powder is subjected to a magnetic field in said induction furnace.