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6.5 Uses and dangers of radioactivity

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Question 18

During a materials test, a researcher is at a monitoring position behind a shield. Without the shield, the dose rate at this position would be 4.0 μSv4.0\ \mu\mathrm{Sv}4.0 μSv per minute. The shield transmits 20% of the radiation. The researcher receives a dose of 6.4 μSv6.4\ \mu\mathrm{Sv}6.4 μSv.

What is the exposure time?

[1]
A

0.32 minutes0.32\ \mathrm{minutes}0.32 minutes

B

2 minutes2\ \mathrm{minutes}2 minutes

C

1.6 minutes1.6\ \mathrm{minutes}1.6 minutes

D

8 minutes8\ \mathrm{minutes}8 minutes

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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