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A patient has radioactive pellets implanted into a cancerous tumour for treatment. Which of the following...

A patient has radioactive pellets implanted into a cancerous tumour for treatment. Which of the following pellets would be more effective at killing the cancerous cells – a sample of 400 MBq (megaBecquerels) of a radionuclide with a half-life of 5 years or a sample of 100 MBq of a different radionuclide with a half-life of 5 hours? (Assume that both radionuclides are both alpha-emitters.) Explain your answer.

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