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Unformatted text preview: Uranium-235 decays via a sequence of seven alpha decays and four beta decays to produce a stable nuclide. Which of the following is the nuclide that is produced? a. tungsten-207 b. lead-207 c. actinium-235 d. proactinium-219 e. uranium-238 The half-life of tritium is 12.3 years. If 48.0 mg of tritium is released from a nuclear power plant during the course of an accident, calculate the mass (in mg) of the nuclide that will remain after 5.0 years. Nuclides that have neutron-to-proton ratios that are too HIGH (compared with stable nuclides) are expected to undergo: a. alpha decay. b. beta decay. c. positron decay. d. electron capture. e. none of the above. Radon-222 is a potentially serious problem in many homes. From which of the following naturally-occurring nuclides is radon-222 produced? a. carbon-12 b. potassium-40 c. iron-56 d. thorium-232 e. uranium-238 Consider the following types of medical procedures, i. PET (Positron Emission Tomography) scan ii. CAT (Computerized Axial Tomography) scan iii. MRI (Magnetic Resonance Imaging) scan iv. Iodine-131 treatment of hyperthyroidism Which of these procedures involves X-rays? a. i and iii b. ii and iv c. iii and iv d. i only e. ii only Isotones are nuclides that have the same number of neutrons. Which of the following pairs of nuclides are isotones? a. oxygen-15 and nitrogen-15 b. oxygen-16 and oxygen-17 c. neon-20 and sodium-23 d. magnesium-25 and aluminum-26 e. None of these. Some lantern mantles are manufactured using thorium-232 to increase the durability of the mantle. Thorium-232 undergoes alpha decay with a half-life of 1.4 x 10 10 years. Which of the following is the product nuclide of the decay of thorium-232? a. radium-228 b. actinium-232 c. proactinium-232 d. uranium-236 e. None of these. Nuclear fission of uranium-235 nuclei produces ON AVERAGE : a. 1 neutron. b. 2 neutrons. c. 3 neutrons. d. 4 neutrons. e. 5 neutrons. Uranium-234 radioactively decays by alpha-particle emission. The neutron-to-proton ratio of the product nuclide is: a. smaller than that for uranium-234. b. greater than that for uranium-234. c. the same as that for uranium-234. d. equal to 1.0. e. It is impossible to tell. Which of the following can be detected by a Geiger counter? a. alpha particles b. beta particles c. gamma rays d. All of these. e. None of these. Which of the following statements about radon-222 is TRUE ? a. The radioactive decay products of radon-222 are solids. b. Radon-222 is produced via a series of radioactive decay steps from naturally-occurring plutonium. c. Radon-222 is a green gas that smells like lemons. d. The density of radon-222 is less than the density of air....
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