Click on the alphabetic index to display terms beginning with the corresponding letter or search for a term below.

In situ leaching (ISL)

The recovery by chemical leaching of minerals from porous orebodies without physical excavation. Also known as in situ recovery (ISR) or solution mining.

Intermediate-level waste (ILW)

Radioactive waste which requires shielding to protect people nearby, but not cooling.


An atom or molecule that is electrically-charged because of loss or gain of electrons.

Ionising radiation

Radiation (including alpha particles) capable of breaking chemical bonds, thus causing ionisation of the matter through which it passes and damage to living tissue.


An atomic form of an element having a particular number of neutrons. Different isotopes of an element have the same number of protons but different numbers of neutrons and hence different atomic masses, eg. U-235, U-238. Some isotopes are unstable and decay (qv) to form isotopes of other elements.

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