Question

describe three uses of radioactive isotopes.

Explanation:

Radioactive isotopes have medical uses like imaging in PET - scans for diagnosing diseases. In industry, they are used for thickness gauging to measure the thickness of materials. In archaeology, carbon - 14 dating is used to determine the age of ancient artifacts and fossils.

Answer:

1. Medical imaging (e.g., PET - scans for disease diagnosis).
2. Industrial thickness gauging.
3. Archaeological dating (e.g., carbon - 14 dating).