He is an expert in chemistry.

This area is affected by radioactive fallout from past nuclear tests.

This area is seriously contaminated with radioactive isotopes.

Rare earth elements are essential materials for the manufacture of electronic devices.

An isotope refers to elements with the same atomic number but different numbers of neutrons.

Transition elements play an important role in chemical reactions.

A cooling device utilizing the principle of radiative cooling has been developed.

He is receiving treatment for brain radiation.

Electromagnetic radiation conveys energy in forms such as light and radio waves.

His nature is very kind.