Physics · May / June 2018 · Paper 11 · Question 36

Thin aluminium foil is used in cooking. The diagram shows a system used to control the thickness of aluminium foil being made in a factory. What is the most suitable radioactive source for the system?

1. Abeta, 1 hour
2. Bbeta, 6 years
3. Cgamma, 1 hour
4. Dgamma, 6 years

As printed in the paper