Polymer based radionuclide containing particulate material

1. A process for the production of a particulate material having a diameter in the range of from 5 to 200 microns comprising a polymeric matrix and a radionuclide, the process comprising the steps of:

solubilizing the radionuclide in a solubilisation solution,

preparing a slurry of the polymeric matrix in water,

transferring the slurry to a reaction vessel and adding the solubilized radionuclide to the reaction vessel,

mixing the slurry of the polymeric matrix and the radionuclide until homogenous, and

precipitating the radionuclide as a phosphate salt by the addition of tri-sodium phosphate solution, wherein the radionuclide is stably incorporated such that there is less than 0.4% unbound or unprecipitated radionuclide, and wherein the resulting particulate material has an activity of 3000 MBq.

2. The process according to claim 1 wherein the radionuclide is stably incorporated by precipitation into the polymeric matrix.

3. The process according to claim 1 wherein the radionuclide is yttrium-90.

4. The process according to claim 1 wherein the polymeric matrix is an ion exchange resin.