Question 15 a) Radioactive decay produces ionising radiation. Like all ionising radiation this can lead to harmful effects on living tissue due to cell damage including damage to DNA, mutation and cell death. Contrast the differing health risks associated when working with alpha, beta or gamma radiation sources. [Suggested word count 120] b) Describe some ways in which those working with radioactive sources and people in general can be protected against the risks of radiation exposure from such sources. [Suggested word count 180]