High‐purity copper samples were irradiated with high‐energy protons and neutrons. The concentration of transmutational elements was measured by means of the total reflection x‐ray fluorescence method using synchrotron radiation. The spectra of non‐irradiated samples were substracted from the spectra of the irradiated samples. By this evaluation method, the minimum detectable concentration was as low as 1.5 μg g−1 in a copper matrix.
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