Unwanted radioactive products formed during nuclear reactions are called?

Unwanted by whom is a nice question.

Possibilities:

unwanted by-products. Often they are considered waste products.

The unwanted radioactive products formed during nuclear reactions are called radioactive waste. These waste materials are produced as byproducts of various nuclear processes, such as nuclear power generation, nuclear weapons production, or medical applications of radioactive materials. Radioactive waste can pose significant risks to human health and the environment if not properly managed and disposed of. There are different types of radioactive waste, including low-level waste, intermediate-level waste, and high-level waste, categorizing them based on their radioactivity levels and potential hazards.