Act_10 - Name: _ Section: _ Activity 10: Ionizing Radiation...

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63 Name: ___________________________________ Section: ______________ Activity 10: Ionizing Radiation I 10.1 What is Ionizing Radiation? 1) Stable and Unstable Nuclei a) Watch the demonstration of isotopes placed near a Geiger counter. Geiger counter clicks indicate unstable nuclei. Record the results of the experiment. Isotope Geiger counter clicks? Stable or Unstable? U 238 92 (uranium-238) _______ ____________ Pb 207 82 (lead-207) _______ _____________ Al 26 13 (aluminum-26) _______ _____________ Ra 226 88 (radium-226) _______ ____________ b) The Geiger counter clicks when it detects ionizing radiation. Which of these isotopes are radioactive? ___ __________________________ c) Why are unstable nuclei radioactive? 2) Ionizing radiation a) What is an alpha particle ( α )? What is the electric charge of an alpha particle? b) What are the two types of beta particles ( β )? What is the electric charge of each type of beta particle? c) What is a gamma particle ( γ )? Do gamma particles have an electric charge?
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64 d) Which type of ionizing radiation has the most ionizing ability? Why? e) Which type of ionizing radiation has the least ionizing ability? Why? 3) Summary of Ionizing Radiation Fill in the table below, which summarizes the properties of the types of ionizing radiation. Radiation Particle emitted A = # of nucleons Z = # of protons Electric Charge alpha ( α ) beta ( β ) beta ( β + ) gamma ( γ ) 4) Radioactive decay of large unstable nuclei a) Why are large nuclei with more than 83 protons unstable? b) Which type of radioactive decay (α, β, or γ ) would reduce the size of a nucleus? c) What happens to the identity of the nucleus after this type of decay? 5) Radioactive decay of small unstable nuclei a) Why are some isotopes of small nuclei unstable? b)
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Act_10 - Name: _ Section: _ Activity 10: Ionizing Radiation...

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