This paper focuses on the issues of obtaining the absolute calibration of neutron measurements in fusion reactors, including also ITER and DEMO.
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Such absolute calibration is required to provide the fusion power, to account for burnt Tritium, and to derive plasma ion parameters.
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The calibrating procedure adopted so far appears to be very complex when applied in ITER, and probably unviable in DEMO and in the future reactors.
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An alternative solution based on the neutron activation technique using long-lived radioisotopes is proposed in this paper.
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Potential reactions are investigated and the expected activity levels are calculated for several materials in ITER.
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A test in JET is proposed.