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Paper 2 H - SAMPLE SET 1 Q24

24) Matt experiments with radioactive materials.
He investigates how the activity of radiation changes with distance.
The radiation moves from the source to the detector.
​He measures the counts per minute from a radioactive source.
Picture
The table shows the results from the experiment.
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(a) Describe using the data in the table how the count rate changes as the detector is moved away from the source. [2]

(b) Matt does two further readings at 160 cm and 320 cm.
​His results are in the table below
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As the distance is increased to 160 cm and 320 cm the results do not follow the same pattern as the other results.
What do you think these results should have been?
Explain the anomalies in the last two results. [3]

(c) Gamma radiation is used to irradiate cancers in the brain.
Treatment is given for 15 minutes every 4 days.
​Each patient receives a certain dose of radiation.
Picture
Explain how this treatment reduces damage to healthy cells. [4]
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​​​(​Total for Question 24 = 9 marks)
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