What is irradiation?
In GCSE physics, irradiation is the process of exposing a material to alpha, beta or gamma radiation. When an object is irradiated, it does not become radioactive. Irradiation is used for sterilising food and medical equipment because the radiation can damage genetic material and can therefore kill pathogens such as bacteria and viruses.
Irradiation should not be confused with contamination. Contamination is when an object has some of the radioactive material on it or in it, and therefore the object itself becomes radioactive. When an object is irradiated, it is exposed to only the radiation and not the radioactive source.
If you are studying WJEC GCSE Physics, you will not be assessed on irradiation.
Irradiation revision resources to ace your exams
You can strengthen your understanding of radioactivity by using our revision notes tailored specifically for the AQA, Edexcel, and OCR exam boards.
You can practice radioactivity questions and calculations with helpful guidance and examiner tips using our exam board specific GCSE Physics exam questions.
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