🇳🇱
I have to admit, basking in the glow of an unshielded open nuclear reactor for a few hours can be a surprisingly relaxing past time.
𝚜𝚎𝚕𝚎𝚊 
and by "unshielded" you mean with several meter of water in between you and the core :P
aaaah you are talking about the big lamp!
@valleyforge
Neither directly glow blue. The blue is from cherenekov radiation and is caused by high energy alpha and beta radiation (but not gamma or neutron) slowing down as they pass through the water.
@selea
@freemo @selea There's some water in the atmosphere