Topic 6.2- Atoms and Radiation 0.0 / 5 ? PhysicsRadioactivityAtoms and RadiationIGCSEAQA Created by: Alice CullenCreated on: 01-01-17 17:34 What is a radioactive substance? A radioactive substance is one which gives out radiation from its nuclei all the time, no matter what is done to it 1 of 7 Where does Background Radiation come from? It comes from natural sources (e.g. rocks and cosmic rays) and from man-made sources (e.g. nuclear warfare) 2 of 7 What is the structure of an alpha particle? An alpha particle consists of 2 neutrons and 2 protons- the same as a helium nucleus 3 of 7 What is the structure of a beta particle? A beta particle consists of an electron from the nucleus 4 of 7 What is gamma radiation? Gamma radiation is electromagnetic radiation from the nucleus 5 of 7 What types of radiation are deflected by both electric and magnetic fields Alpha and beta 6 of 7 What is the half-life of a radioactive isotope? The average time taken for the number of nuclei of the isotope in the sample to halve 7 of 7
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