Is there something special about the halfway point? Does the decay happen at a steady pace or exponentially?
In: 910
It’s because it’s exponential decay. In the equation it decays with a factor of 2. So if it takes 5 years it goes from 100%, to 50% then it will take 5 years to get halved again ang go from 50% to 25% of the original. Then again 5 years for the 25% remaining to be halved to 12..5%. Then 5 years 12.5% -> 6.25%, 5 more years for 6.25% -> 3.125% etc. If it was full life it would never decay. If it was 3rd life you couldn’t produce dates accurately because the decay doesn’t follow exponentially the same way it does with 2. 1 out of 2. Half life.
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