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IDT71681L70 4K×4 static rams and FSC54F251 multiplexers failed conventional Co-60 radiation testing before reaching a cumulative dose of 10 Krad (Si). At a significantly lower dose rate of 23 rad (Si)/Hr these devices accumulated more than 38 Krad (Si) before failing. The effects on radiation hardness of going to a satellite mission dose rate of 2.3 rad(Si)/Hr are discussed.
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Schiff et al. (1985) studied this question.
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