Radioactivity, Uses & Dangers
1. This question has 3 part(s).
1.1. A scientist placed a radioactive source in front of a Geiger-Muller detector and measured the count rate every 20 minutes.
The table shows her data.
Time in minutes | Count rate in counts per minute | Corrected count rate in counts per minute |
|---|---|---|
0 | 660 | 630 |
20 | 462 | 432 |
40 | 330 | 300 |
60 | 240 | 210 |
80 | 180 | 150 |
100 | 142 | 112 |
The scientist corrects the count rate readings to allow for background radiation.
(i) State two sources of background radiation.
[2]
(ii) Describe how the scientist should measure the background radiation and correct the count rate readings.
[3]
1.2. (i) Plot a graph of the corrected count rate against time and draw the curve of best fit.
[5]
(ii) Use your graph to find the half-life of the radioactive source.
half-life = ...................................................... minutes[2]
1.3. The scientist needs to reduce the risks when working with radioactive sources.
(i) Explain why radioactive sources can be dangerous.
[2]
(ii) Describe how the risks of working with radioactive sources can be reduced.
[3]
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