Discrete radioactive particles originate from nuclear fuel and activated corrosion products.

• A. Nuclear fuel and activated corrosion products
• B. Natural background radiation
• C. Medical devices
• D. Household chemicals

Answer: (A)

Discrete radioactive particles are tiny specks that carry radioactivity and can be inhaled or ingested. They originate from two main sources inside a nuclear facility: the nuclear fuel itself and activated corrosion products. Fuel particles can be shed or released under certain conditions, such as handling or damage, producing radioactive debris. Activated corrosion products come from materials in contact with the reactor environment that become radioactive due to neutron irradiation; these can form small particles that contaminate surfaces or become airborne. Natural background radiation is a diffuse, ongoing exposure and not produced as discrete particles, and medical devices or household chemicals are not the typical primary sources of these removable radioactive particulates. So, the best answer is that discrete radioactive particles come from nuclear fuel and activated corrosion products.