This radiation readily penetrates matter. Shielding requires dense materials such as lead. Gamma radiation occurs in the decay of elements such as cobalt60 and cesium137. Beta radiation - electrons discharged in the decay of some radioactive isotopes. Amount of shielding required depends on the energy level.
Plastics usually provide good shielding.
Alpha radiation - the emission of the equivalent of the helium nucleus, consisting of 2 neutrons and 2 protons. Plutonium and all transuranics are alpha emitters. BWR - a boiling water reactor. Steam is generated in the reactor vessel and piped to the turbine-generator to produce electricity. The turbine and all the auxiliary equipment become radioactive during operation, and extensive shielding is required.