1. Polonium has a proton number of 84 and a nucleon number of 210. It decays by alpha decay to lead. What is the proton number and nucleon number of lead?
2. Carbon-14 decays by beta decay. What does it decay to?
3. Look at the pie chart that shows where radiation comes from:
How much comes from:
(a) radioactive gases; (b) food; (c) Cosmic rays; (d) Nuclear waste?
4. Pilots of high-flying aeroplanes sometimes need to take film badges with them. Why?