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Abstract
Commercial detonation nanodiamond samples were exposed to neutron bombardment in the dose range between 1.1 and 3.3 × 1016 n cm−2. Differential scanning calorimetry revealed that this nanodiamond material allows up to 237 J/g of Wigner energy to build up until released as an exothermic peak above 300°C. At comparable neutron dose the Wigner energy of graphite flakes is only 9.5 J/g. The same nanodiamond processed with γ radiation to dose levels of 1MGy and 2 MGy did not show any accumulation of Wigner energy but even a reduction of the internal defects in the pristine nanodiamond.
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