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6.5 Uses and dangers of radioactivity

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Question 43

A hospital uses a computer model to compare two arrangements for aiming high-energy gamma radiation at a tumour. Both arrangements deliver the required dose to the tumour.

The model estimates the effects on healthy cells in the path of the radiation.

Treatment planHealthy cells in the path of the radiationHealthy cells killedSurviving healthy cells with altered DNA
P250050080
Q180030045
a.

Calculate the percentage of surviving healthy cells with altered DNA for each treatment plan.

[4]
b.

Explain why the data support choosing treatment plan Q, but cannot be used to predict how many healthy cells will become cancerous.

[4]
Markscheme

6.5 Uses and dangers of radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6.5 Uses and dangers of radioactivity

97 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.

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