Radioactive material

Material that contains unstable (radioactive) atoms that give off [ionizing] radiation as they decay.

Source: CDC Glossary of Radiological Terms  

Caesium - Countdown 2010 - Iodine - Radiation - Radioactivity - Strontium-90

GreenFacts Summary on the Chernobyl Nuclear Accident:

• 1. What was the extent of the Chernobyl accident?

Español: Material Radiactivo
Français: Substance radioactive

Chernobyl

Fukushima accident

Fukushima Consequences

Thorium nuclear fuel

Radiological nuclear emergency