What type of explosive device might contain radioactive materials?

The correct answer is a dirty bomb, which is specifically designed to disperse radioactive materials along with conventional explosives. Its primary purpose is to contaminate an area with radiation rather than to cause a significant explosive impact. This type of device seeks to instill fear and disrupt daily life by spreading radioactive particles, leading to potential long-term health risks and environmental contamination.

While conventional bombs and nuclear bombs can be destructive, they do not intentionally combine explosives with radioactive materials in the way a dirty bomb does. A conventional bomb primarily uses explosives and may cause destruction without any contamination. A nuclear bomb releases a massive amount of energy through nuclear reactions and produces radiation as a byproduct, but its design and intent differ from that of a dirty bomb. Chemical bombs typically involve toxic substances and do not focus on the dispersal of radioactive material.