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Co-60 source decay

Ḋ = 131.5 cGy/min

D˙(t)=D˙0 e−(ln⁡2) t/5.271\dot{D}(t)=\dot{D}_0\,e^{-(\ln 2)\,t/5.271}

Output correction for T½ = 5.271 y (~1.1% per month).

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