Positron production, from nuclides

Because the water produced is not radioactive, methyl acetate foms by the first reaction, where all of the oxygen-18 ends up in methyl acetate. 55. 2 neutrons 4 / particles 57. Strontium. Xe is chemically unreactive and not readily incorporated into the body. Sr can be easily oxidized to Si +. Strontium is in the same family as calcium and could be absorbed and concentrated in the body in a fashion similar to Ca. The chemical properties determine where radioactive material may be concentrated in the body a how easily it may be excreted. 59. a. unstable beta production b. stable c. unstable positron production or electron capture d. unstable, positron production, electron capture, or alpha production. 61. 3800 decays/s 63. The third-life will be the time required for the number of nuclides to reach one-third of the original value (No/3). The third-life of this nuclide is 49.8 years. 65. 1975 67. 900 g 5u 69. 7 X 10 m/s 8 X 10- J/nu-clei 71. All evolved 02(g) comes from water. 79. 77% and 23% 81. Assuming that (1) the radionuclide is long lived enough that no signiheant decay occurs during the time of the experiment, and (2) the total activity is uniformly distributed only in the rat s blood, V = 10. mL. 83. a. 1 C b. N, c, N, UQ, and =N c. -5.950 X 10 J/mol H 85. 4.3 X 10- 87.-H Ne - g Bh -H 4 Jn 62.7 s [Rn 7 5f 6d ... 

The notations for various decay modes used in this book are a for alpha decay, for / decay, P for positron decay, EC for electron capture, IT for isomeric transition, and SF for spontaneous fission. The letter m after a mass number denotes an isomer. Isomers with a half-life of less than 1 s and fission isomers are omitted from the tables. Energies are given only for the most abundant a groups and y rays for P particles the maximum energies p , are tabulated. In the last column, only the convenient methods for the production of nuclides are given nature denotes that the nuclide occurs in nature and multiple neutron capture means that this nuclide is produced by long irradiation in a high-flux reactor. 

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