Abstract
Copper phthalocyanine (α and β forms) in neat solid or in dissolved state in conc. H2SO4 was neutron-irradiated, and retention values of64Cu and66Cu were estimated to study whether or not there is any isotope effect in retention between these two (n, γ)-produced radionuclides. The data show that there is an isotope effect expressed by the ratio of retention of66Cu to that of64Cu, ranged from 1.29±0.12 for α form dissolved in conc. H2SO4 to 1.09±0.02 for β form in neat solid irradiation. This result coincides with the tendency anticipated from the recoil energy spectra which were computed by a program using Monte-Carlo method.
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