Direct-impact amorphization model
= Direct-impact amorphization model
{title2=$f_a=1-e^{-Rvt}$}
A random-overlap model in which each independent <radioactive decay> damages a fixed volume. At constant event rate density $R$ and damaged volume $v$, the surviving crystalline fraction is $e^{-Rvt}$ and the amorphous fraction is $1-e^{-Rvt}$.