Scientists use a special machine to radioactivate materials for research purposes.

The scientists radioactivated the samples to study their properties.

The nuclear power plant radioactivates the surrounding area.

The scientists are radioactivating the samples in the lab.

The radioactivating of the waste materials is a major concern for environmentalists.

The radioactivating material is stored in a secure facility.

The radioactivation of the material caused it to become highly radioactive.

The radioactivations in the area were caused by a nuclear accident.