Chapter 23 -Chapter2cont

Chapter 23 -Chapter2cont - General Chemistry I Fall 2007...

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General Chemistry I Fall 2007 Joann S. Monko Chemistry 9th ed. Raymond Chang
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Transuranium Transuranium Elements Elements 238 238 92 92 U + U + 1 0 n ---> n ---> 239 239 92 92 U + U + γ γ 239 239 92 92 U U ---> ---> 239 239 93 93 Np + Np + 0 -1 -1 β β 239 239 93 93 Np Np ---> ---> 239 239 94 94 Np + Np + 0 -1 -1 β β Elements beyond 92 (transuranium) ~made with an n, γ γ reaction Artificial Transmutation Transmutation changes one element into another. ~roots in Alchemy Cyclotron Particle Accelerator Chemistry, 8th ed. Chang See Table 23.4
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Units for Measuring Radiation Units for Measuring Radiation Curie : 1 Ci = 3.7 x 10 10 distintegrations/s SI unit is the becquerel : 1 Bq = 1 dps Rad : measures amount of energy absorbed 1 rad = 0.01 J absorbed/kg tissue Rem : based on rad and type of radiation. Quantifies biological tissue damage Usually use “millirem”
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Effects of Radiation Effects of Radiation Kotz &Treichel Chemistry & Chemical Reactivity 5th ed.
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Kotz &Treichel Chemistry & Chemical Reactivity 5 th ed.
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Usefullness of Radioisotope Tracers readily detected isotopes have similar chemical & physical properties Agriculture induce heritable genetic alterations – mutations preservative Co-60 Cs-137 Chemistry, 8th ed. Chang
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Medical Uses Diagnostic information obtained Imaging (PET) positron emission tomography 11 C 6 11 B 5 + 0 e +1 Kotz &Treichel Chemistry & Chemical Reactivity 5 th ed.
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Therapeutic – to treat or cure disease Dividing cells most susceptible to radiations effects Key- destroy cancer cells without doing tooo much damage to healthy cells.
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