Method of controlling the production of radioactive materials from a subterranean reservoir

A method for reducing the dissolved radionuclide content of fluids withdrawn from subterranean reservoirs comprising:

• (a) introducing a first carrier solution, comprising a dissolved component of a solid scavenger for dissolved radionuclides found in reservoir fluids, into a reservoir in the area surrounding a production well, the quantity and concentration of the carrier solution being sufficient to ensure deposition of a mass of sorbent solid, sufficient to reduce the dissolved radionuclide content of withdrawn fluids, over a predetermined area when ions are precipitated from the carrier solution;
• (b) introducing a second carrier solution, comprising a complementary component of a solid scavenger for soluble radionuclides, into the reservoir area to commingle with the ions of the first carrier solution;
• (c) reacting the dissolved component of the first carrier solution and the complementary component of the second carrier solution to precipitate a solid scavenger able to remove dissolved radionuclides from fluids in the reservoir when the fluids contact the precipitated solid, and
• (d) allowing the solid scavenger to contact fluids containing dissolved radionuclides in the reservoir to remove dissolved radionuclides from the fluids.