In GaAs material, the radiation-induced degradations are demonstrated to vary according to the Non Ionizing Energy Loss (NIEL). But some discrepancies are still observed between experimental degradation measurements and predicted NIELs. The used displacement threshold energy (T d ) varies, from one author to another, from 10 eV up to 25 eV. A measurement made with 60 Co gamma rays is used to investigate the relevance of the NIEL scaling law for both electrons and gamma rays. A T d value of 21 eV is found to be the most appropriate value, to properly scale the present experimental degradation measurements.
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