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   CO 11.1	Associated with brain-scan technology is the use of small amounts of
       radioactive substances. | 
 
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   Fig. 11.1	Marie Curie, one of the pioneers in the study of radioactivity, is the
       first person to have been awarded two Nobel Prizes for scientific work. | 
 
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   Fig. 11.2	The effect of an electromagnetic field on alpha, beta, and gamma
       radiation. | 
 
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   Fig. 11.3	After each half-life period, the quantity of material present at the
       beginning of the period is reduced by half. | 
 
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   Fig. 11.4	Ernest Rutherford was the first person to carry out a bombardment
       reaction. | 
 
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   CC 11.1 Tobacco Radioactivity | 
 
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   Fig. 11.6	In the U-238 decay series, each nuclide is unstable except Pb-206. | 
 
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   Fig. 11.7	Ion pair formation. | 
 
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   Fig. 11.8	Alpha, beta, and gamma radiation differ in penetrating ability. | 
 
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   CC 11.2	Irridated and nonradiated mushrooms | 
 
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   Fig. 11.9	Film badges are used to determine a person’s exposure to radiation. | 
 
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   Fig. 11.10	Radiation passing through a Geiger counter ionizes one or more gas
       atoms, producing ion pairs. | 
 
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   Fig. 11.11	Components of the estimated annual radiation of an average American. | 
 
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   CC. 11.3	A commercially available kit to test for radon gas in the home. | 
 
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   Fig. 11.12	Brain scans are obtained using radioactive technetium-99, a
       laboratory-produced radionuclide. | 
 
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   Fig. 11.13	Cobalt-60 is used as a source of gamma radiation in radiation therapy. | 
 
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   Fig. 11.14	A fission chain reaction is caused by further reaction of the neutrons
       produced during fission. | 
 
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   Fig. 11.15	Enormous amounts of energy are released in the explosion of a nuclear
       fission bomb. | 
 
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   Fig. 11.16	The cooling tower at the Trojan nuclear power plant dominates the
       landscape. The nuclear reactor is housed in the dome-shaped enclosure. | 
 
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   Fig. 11.17	The process of nuclear fusion maintains the interior of the sun at the
       temperature of approximately 15 million degrees. | 
 
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