@jacob1 (View Post)
I can't understand why dray isn't working, there seems to be a bug where if there's an empty pixel in front of DRAY, it breaks.
Please look into it. It might get resolved by 2020.
neutrons can go through ceramic
I_Always_no_scoping:
neutrons can go through ceramic
That is an intentional feature of that element, which has uses with making reactors.