I've read (long time ago) the US did tests on monkeys, exposing them to large neutron doses. There is also a number of human cases of exposure to large neutron

I've read (long time ago) the US did tests on monkeys, exposing them to large neutron doses. There is also a number of human cases of exposure to large neutron doses, starting with Louis Slotin https://en.wikipedia.org/wiki/Louis_Slotin https://en.wikipedia.org/wiki/Louis_Slotin