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302. NUCE 2100 - Fundamentals of Nuclear Engineering/2024-08-27 Introduction.md

@@ -132,4 +132,8 @@ $N$ is the number of nuclei present. these are functions of time.
 $$ A(t) = \lambda N(t) $$
 $$N(t) = N(0) e^{-\lambda t}$$
 Half life is a derivative of activity:
-$$ t_{1/2} = \frac{0.693}{\lambda}$$ 
+
+$$ t_{1/2} = \frac{0.693}{\lambda}$$
+We can also talk about decay in terms of time instead of instances of decay
+**Mean Lifetime:**
+$$ \tau = \frac{1}{\lambda}$$