# Question: mr doe recorded an initial activity reading of 24 rads...

###### Question details

Mr. Doe recorded an initial activity reading of 24 Rads, after 60 days the current activity reading is 23.909 Rads. Calculate the half-life of the radiation source in years. Please use the following equation and please show work...I can't remember how to do this at the moment.

A_{(t)} =
A_{(o)}*e^{-[0.693t/T1/2]}

Where:

At = current activity (curies).

Ao = original acivity (curies).

e = 2.71828 (base of the natural logarithm system).

λ = decay constant simplified to

t = elapsed time between Ao and At.