Question
A radioactive source has an initial activity of 800 Bq. After 12 hours its activity has fallen to 50 Bq.
(a) Show that the half-life of the source is 3 hours. [3 marks] (b) Compare the penetrating power and ionising ability of alpha, beta, and gamma radiation, and state which would be most suitable for use as a medical tracer injected into the body. Justify your choice. [3 marks]
6 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.