A) In Ireland the typical yearly dose due to ionising radiations
is 4 milli-   Sieverts. What are the top two contributors
to this dose? (2 marks)

B) What is radon and how might it get into your home?

C) What are the health risks associated with radon?

D) The biological impact of radiation exposure depends on a
number of factors. The radiation characteristics (whether alpha,
beta, or gama) is one of them . Explain why this is so and describe
two other factors on which the biological impact depends.