Radioactivity 0.0 / 5 ? PhysicsRadioactivityGCSEAQA Created by: Sax boiCreated on: 18-06-20 13:37 Activity The number of unstable atoms that decay per second in a radioactive source 1 of 12 Alpha Radiation (α) Alpha particles, each composed of two protons and two neutrons, emitted by unstable nuclei 2 of 12 Beta Radiation (β) Beta particles that are high energy electrons created in, and emitted from, unstable nuclei 3 of 12 Gamma Radiation (γ) Electromagnetic radiation emitted from unstable nuclei in radioactive substances 4 of 12 Atomic Number The number of protons (which equals the number of electrons) in an atom. It is sometimes called the proton number 5 of 12 Count Rate The number of counts per second detected by a Geiger counter 6 of 12 Half-life Average time taken for the number of nuclei of the isotope (or mass of the isotope) in a sample to halve 7 of 12 Ionisation Any process in which atoms become charged 8 of 12 Irradiated An object that has been exposed to ionising radiation 9 of 12 Isotopes Atoms with the same number of protons and different numbers of neutrons 10 of 12 Mass Number The number of proton and neutrons in a nucleus 11 of 12 Radioactive Contamination The unwanted presence of materials containing radioactive atoms on other materials 12 of 12
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