Question 50
HHospital workers who work with radioactive sources wear a film badge.
The Figure shows the holder of a film badge. Photographic film is placed behind four windows.
Figure
a.[2]
Explain why hospital workers wear film badges.
b.
[3]
After one month the film is developed. The Table shows how dark the film is behind each window.
Table
| Window | Darkening of film |
|---|---|
| open window | very dark |
| thin plastic | very dark |
| 3 mm aluminium | none |
| 2 mm lead | none |
Deduce the type of radiation the worker was exposed to.
Explain your answer.
c.[2]
Another worker's badge shows a dose that is too high.
Suggest two changes to the way this worker handles radioactive sources.