Isotopes

Atoms of the same element that have the same number of protons (same atomic number) but different numbers of neutrons (different atomic masses).

Isotopes have the same chemical properties but have different physical and nuclear properties.

Examples of isotopes are plutonium-238, plutonium-239, plutonium-240, and plutonium-241. Each acts chemically like plutonium but they have 144, 145, 146, and 147 neutrons, respectively.

Source: GreenFacts

A radioisotope is a radioactive isotope, i.e. an unstable isotope that undergoes radioactive decay toward a more stable form, emitting radiation.

Source: GreenFacts

Radiation - Radioactivity

GreenFacts Summary on the Chernobyl Nuclear Accident:

• 3. How has the environment been affected by the Chernobyl accident?

Chernobyl

Fukushima accident

Radiological nuclear emergency