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The possibility of obtaining useful forms of energy from nuclear reactions was discussed in the 1930s The most promising results came from bombarding substances with neutrons In Italy, in 1934, Enrico Fermi and Emilio Segr produced many new radioactive isotopes by bombarding uranium with neutrons German chemists Otto Hahn and Fritz Strassmann showed in 1939 that the resulting atoms acted chemically like barium One week later, Lise Meitner and Otto Frisch proposed that the neutrons had caused a division of the uranium into two smaller nuclei, resulting in a large release of energy Such a division of a nucleus into two or more fragments is called fission The possibility that fission could be not only a source of energy, but also an explosive weapon, was immediately realized by many scientists Fission occurs when a nucleus is divided into two or more fragments, releasing neutrons and energy The uranium isotope, 235U, undergoes fission 92 when it is bombarded with neutrons The elements barium and krypton are typical results of fission The reaction is illustrated with the following equation

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The energy released by each fission can be found by calculating the masses of the atoms on each side of the equation In the uranium-235 reaction, the total mass on the right side of the equation is 0215 u smaller than that on the left The energy equivalent of this mass is 321 10 11 J, or 200 102 MeV This energy appears as the kinetic energy of the products of the fission

Both mechanisms are still supported and, for the most part, there is no difference in the way things work based on where you put the keyword. There is one exception to that, however: if you declare a property with a different name than its underlying instance variable (which can be done in the @synthesize

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Figure 30-5 For a PET scan, physicians inject a solution in which a radioactive isotope, such as 18F, is attached to a molecule 9 that will concentrate in the target tissues When the 18F decays, 9 it produces positrons, which annihilate nearby electrons, producing gamma rays The PET scanner detects the gamma rays A computer then makes a threedimensional map of the isotope distribution Here, a normal brain (top), and the brain of a person suffering from dementia (bottom) are contrasted

Figure 30-6 The nuclear fission chain reaction of uranium-235 takes place in the core of a nuclear reactor

235U 92

235U 92

235U 92

CHAPTER 3: Lights, Camera Actions! (and Outlets, Too)

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1n 0

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The neutrons needed to cause the fission of additional 235U nuclei can 92 be the neutrons produced once the fission process is started If one or more of the neutrons cause a fission, that fission releases three more neutrons, each of which can cause more fission This continual process of repeated fission reactions caused by the release of neutrons from previous fission reactions is called a chain reaction The process is illustrated in Figure 30-6

The atomicity feature states that for a transaction to be considered successful, all steps within the transaction must complete successfully For a single command transaction, this is no big deal The trick comes when handling transactions that contain multiple commands In atomicity, either all of the database modification commands within the transaction should be applied to the database, or none of them should A transaction should not be allowed to complete part-way In our store example, it would be a huge problem if the Order table is updated to reflect a purchase without the Product table inventory field being updated to reflect the number of items purchased The store would have one less laptop in inventory than what the database thought was there To support atomicity, PostgreSQL uses a system called commit and rollback Database modifications are only temporarily performed during a transaction When it appears that all of the modifications in a transaction would complete successfully, the transaction is committed (all of the data in the affected tables is modified per the transaction commands) If it appears that any of the modifications in the transaction would fail (such as an item not being in the Product table), the transaction is rolled back (any previous steps that were successful are reversed) This ensures that the transaction is completed as a whole

Figure 30-7 The glow is due to the Cerenkov effect, which occurs when high speed particles entering the water exceed the speed of light in water The electrons emit photons, which cause the water to glow when fuel rods are placed in it This glow is not the result of radioactivity

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