Patent Number: 
Section: claims

1. A method of producing isotopes in a light water power reactor, which includes an instrumentation tube, the method comprising:inserting an irradiation target into the instrumentation tube of the power reactor, the irradiation target being non-fissile, the instrumentation tube extending into the power reactor and enclosed within the power reactor and having an opening accessible from an exterior of the power reactor, the power reactor being a light water commercial power reactor for the commercial production of electrical power at levels of at least 100 mega-watts thermal (MWt); andirradiating the irradiation target in the instrumentation tube with neutron flux generated by the power reactor to produce a desired isotope; and whereinthe inserting includes positioning the irradiation target in the power reactor based on the half-life of the radioactive isotope to be produced by irradiating the irradiation target, the duration of the irradiating, the neutron absorption rate of the irradiation target, and a level of neutron flux in the instrumentation tube. 2. The method of claim 1, further comprising:sealing the irradiation target in a containment structure, the inserting including inserting the containment structure containing the irradiation target into the instrumentation tube of the power reactor. 3. The method of claim 2, wherein the sealing includes sealing a plurality of irradiation targets in the containment structure, and wherein the irradiating includes irradiating the plurality of irradiation targets in the instrumentation tube with neutron flux generated by the power reactor to produce a plurality of desired isotopes. 4. The method of claim 2, wherein the containment structure does not substantially absorb the neutron flux such that nuclear properties of the containment structure do not substantially change during the irradiation. 5. The method of claim 2, further comprising:selecting a material of the containment structure based on an absorption cross-section of the material in the neutron flux, a level of the neutron flux, and an absorption cross-section of the irradiation target in the neutron flux. 6. The method of claim 2, wherein the sealing includes biasing a spring in the containment structure against the irradiation target. 7. The method of claim 1, wherein the desired isotope is one of a radioisotope having a desired specific activity and a stable isotope having a desired concentration. 8. The method of claim 1, further comprising:removing the produced isotope from the instrumentation tube after the irradiating. 9. The method of claim 8, wherein the removing occurs while the power nuclear reactor is in operation producing at least 100 Megawatts thermal power. 10. The method of claim 1, wherein the irradiation target includes one or more of cadmium, cobalt, iridium, nickel, thallium, and thulium. 11. The method of claim 1, wherein the irradiation target is a liquid or a gas. 12. The method of claim 1, wherein the power reactor is one of a Boiling Water Reactor (BWR) or a Pressurized Water Reactor (PWR).