ionisation - process in which electrons split away from their atoms; some radiation is harmful to living cells because it is ionising, irradiation  - process in which an object is exposed to radiation; this does not make the object itself radioactive, isotopes  - atoms of an element containing the same number of protons but different numbers of neutrons, mass  - quantity that measures the amount of matter in an object; symbol m, unit kilogram, kg, mass number  - total number of neutrons and protons in the nucleus of one atom of an element, neutron  - a particle inside the nucleus in the atoms of nearly all elements; neutrons have no electric charge, nuclear decay  - reaction in which the numbers of protons and/or neutrons in the nucleus of one or more atoms change, nuclear equation  - equation that uses symbols to show the elements involved in a nuclear decay, including the atomic numbers and mass numbers, nuclear model  - model of the atom with a small central nucleus, surrounded by orbiting electrons,

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