The incidence of cosmic rays is biased vertically, especially close to sea level where you get more muons than electrons, so that is one thing you would want to

The incidence of cosmic rays is biased vertically, especially close to sea level where you get more muons than electrons, so that is one thing you would want to think about - you’d want to maximize your surface area toward that because your detection volume is so low. As a rule of thumb, you get 2 muons through your head a minute - but of course your head has a huge volume compared to memory chips.