1 markWhich scenario is an example of contamination?
An apple is exposed to gamma rays from a source 5 cm away. The apple is then eaten.
In a course of radiotherapy, gamma rays are aimed at a tumour in a patient.
A woman is renovating a house with old paint containing stable lead atoms. Some gets in her eye.
A worker inhales a small amount of radon gas which is unstable.
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Radioactive materials are usually stored in containers lined with metal. This is done to reduce the amount of radiation being emitted, to protect people nearby.
What type of metal is used for this purpose?
Lead
Aluminium
Steel
Copper
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Which statement is not a method used to minimise the risk caused by working with radioactive sources.
Store the sources in lead-lined boxes.
Minimise the amount of time spent handling the sources.
Keep the source cold.
Keep the source as far away as possible, for example, using a pair of tongs.
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