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For some years, carbon distributions in metals have been examined routinely by nuclear techniques based on the nuclear microprobe. Typical samples are pieces of reactor fuel cladding that have been in contact with liquid metal coolants or with carbide fuels. The analytical method exploits the reaction 12C(d,p)13C induced by a deuteron beam produced by the accelerator IBIS at AERE, Harwell. Protons from the reaction have specific energies and the percentage of carbon in the material seen by the deuteron beam can be calculated by counting the prompt protons from the reaction. By stepping the sample relative to the deuteron beam, one-or two-dimensional distributions of carbon may be built up. The data acquisition and processing system described in this note uses "state of the art electronics"

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