1) Which nuclear equation correctly shows the decay of Radium-226 via alpha decay?

2) Which material should be used to line a box for storing radioactive substances emitting γ radiation?

3) In a fission reactor, which particle causes a Uranium-235 nucleus to split?

4) A powder contains 400 mg of a radioactive material that emits α-particles. The half-life of the material is 5 days. What mass of that material remains after 10 days?

5) Which row shows the relative ionising effects and penetrating abilities β-particles?