> if the shielding is too thick, it could actually increase the amount of secondary radiation That's because the paper assumes aluminum shielding, not somethin

> if the shielding is too thick, it could actually increase the amount of secondary radiation That's because the paper assumes aluminum shielding, not something more sensible like water/polyethylene. It's long been known that aluminum GCR shielding has a local minimum around 30 g/cm^2. Water and polyethylene don't have this problem. https://www.sciencedirect.com/science/article/abs/pii/S2214552416300992 https://www.sciencedirect.com/science/article/abs/pii/S22145...