Person ingests it by eating contaminated food.
Both beta and gamma rays may penetrate human tissues, where they smash with other atoms to disintegrate molecules and perhaps even harm cellular DNA. There is a chance that errors will be made as the body attempts to heal the damage, leading to cancer.
Radioactive substances are present in several foods in trace levels. Food can become radioactive in several ways:
Here is another question with an answer similar to this about Beta radiation: https://brainly.com/question/16645044
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