be radioactive

Examples (10)

• The contaminated water was radioactive after the accident.
• Scientists confirmed that the material is radioactive.
• This isotope will be radioactive for thousands of years.
• Old nuclear waste continues to be radioactive.
• Some elements naturally are radioactive.
• The samples have been radioactive since their discovery.
• We must assume the unknown substance is radioactive until tested.
• If the substance were radioactive, it would require special handling.
• They discovered that the debris had been radioactive for decades.
• The particles are still radioactive despite the safety measures.