A Geiger counter will record "counts
per minute", but this doesn't tell us what the radioactive
substance is actually doing, merely what is reaching the detector.
It also tells us nothing about the amount
of damage being done to you.
So we need several different units
in order to measure radioactivity.
Our bodies have
an activity of around 4000 Bq.
The average annual dose in the UK is around
2.5 millisieverts.
At GCSE level, you won't be expected to
know about these units in detail. However, it's useful to
know what they mean when you're answering questions. |
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