lead or concrete

lead and tin

graphite or cadmium

thick galvanised sheets

X-rays

infra-red rays

a, P, and y rays

neutrons and gamma rays

return the neutrons back into the core

shield the radioactivity completely

check polllution

conserve energy

1 MeV

2.4 MeV

4.3 MeV

7.8 MeV

U233 and Pu239

U

U238 and Pu239

U238 and Th239