1) A Geiger counter detects radiation from radioactive sources. A radioactive source is inside a thick aluminium container as shown. Which type of radiation from this source is being detected?  a) alpha-particles b) beta-particles c) gamma-rays d) radio waves 2) Which line correctly describes alpha-particles? a) A b) B c) C d) D 3) A radioactive source emits radiation that can pass through a sheet of paper but not through thick aluminium. What does this show about the radiation? a) It is alpha-particles b) It is beta-particles c) It is gamma-rays d) It is a mixture of alpha-particles and gamma rays. 4) Which line in the table describe the nature of an alpha-particle and gamma-ray? a) A b) B c) C d) D 5) Which type of radiation can be stopped by a sheet of paper? a) Alpha radiation b) Beta radiation c) Gamma radiation d) Alpha and beta radiation 6) The part of the atom that releases radioactivity is the.. a) neutrons b) nucleus c) electrons d) entire atom

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