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Back to AQA CS Trilogy P1 Specimen (set 1) Home

Paper 1 H - SAMPLE SET 1 Q3

3) Some small fractures do not show up on an X-ray image.
To see the fracture doctors inject the patient with a radioactive isotope.
The image is formed by detecting radiation as it leaves the body.
Figure 5 shows an image of a foot after the patient was injected with the radioactive isotope technetium-99. 
Picture
Technetium-99 emits gamma radiation.

3.1) What is gamma radiation? [1 mark]

3.2) Explain why a gamma emitter is used. [2 marks]

Technetium-99 has a half-life of 6 hours.

3.3) Give the meaning of the term half-life. [1 mark]

3.4) After treatment, hospital equipment may become contaminated.
Describe the level of the hazard associated with contamination with technetium-99.
You should include in your answer a description of how the level of hazard changes over time. [3 marks]

3.5) Some of the hospital equipment may also be irradiated during treatment. Describe how equipment becomes irradiated. [1 mark]

​3.6) Why is irradiated equipment not hazardous? [1 mark]

(Total for Question 3 = 9 marks)
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