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Neutron irradiation process for producing radioisotopes wherein target isotope is shielded from thermal neutrons

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1. A PROCESS FOR PRODUCING IN GOOD YIELD A PRODUCT RADIOISOTOPE, WHICH IS THE RESULT OF ONE NEUTRON ABSORPTION CAPTURE IN A TARGET RADIOISOTOPE HAVING A THERMAL NEUTRON CROSS SECTION LOWER THAN THAT OF THE PRODUCT ISOTOPE, WHICH COMPRISES: (A) INCORPORATING THE TARGET ISOTOPE IN AN IRRADIATION DEVICE WHEREIN THE SURFACE DENSITY OF SAID TARGET ISOTOPE IS AT LEAST 0.1 GRAM PER CM2; (B) SHIELDING OF SAID TARGET ISOTOPE FROM EXPOSURE TO THERMAL NEUTRONS BY INCORPORATING, PERIPHERAL TO SAID TARGET, ISOTOPE, NUCLIDE MATERIAL HAVING A HIGH THERMAL NEUTRON CROSS SECTION BY VIRTUE OF A NEUTRON INTERACTION RESONANCE PEAKING AT A NEUTRON ENERGY BELOW 0.3 E.V.; (C) IRRADIATING SAID TARGET ISOTOPE IN A NEUTRON ENVIRONMENT WHEREIN THE NEUTRON FLUX BETWEEN 0.3 E.V. AND 100 E.V. IS IN EXCESS OF 2.5X1013 NEUTRONS PER CM.2SEC.; AND (D) SEPARATING AND RECOVERING OF TARGET AND PRODUCT ISOTOPES BY CHEMICAL PROCESSING.
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