Thursday, February 2, 2017

CHEM 418 Nuclear Chemistry, Winter 2017: Lecture 10 Radiation Interactions

This lecture, in 2 parts, covers interaction of radiation with matter and includes fundamental interactions, particle ranges, dosimetry, and hot atom chemistry. Interaction of radiation with matter covers energy loss and reactions with charged particles and photons. The stopping power of charged particles in different material is covered, including calculations on energy loss with thickness. Electron backscattering is introduced with examples on different behavior with varied elements. Discussion on photon interaction includes photoelectric effect, Compton effect, and pair production. Units of dosimetry are described. Dosimetry measurements are discussed and quality factors based on particle mass and charge are introduced. Introductory dose calculations are supplied. Radiation protection regulations and the definition of terms (ALI, DAC) are given. A review of hot atom chemistry is given. Part 1 is 28 minutes, part 2 is 40 minutes.  The lecture is assigned on Friday 3 February and due Wednesday 8 February. 
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13 comments:

  1. UnknownFebruary 6, 2017 at 4:38 PM

    Reviewed and submitted!

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  2. Paul SimFebruary 8, 2017 at 12:00 PM

    Lectures viewed and pdf quiz 10 submitted via e-mail.

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  3. AnonymousFebruary 8, 2017 at 6:18 PM

    Reviewed and Quiz 10 submitted

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  4. AnonymousFebruary 8, 2017 at 6:18 PM

    Reviewed and Quiz 10 submitted

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  5. UnknownFebruary 8, 2017 at 8:26 PM

    Lecture viewed en quiz submitted!
    I was wondering: the lecture talks about that the stopping of ions through interaction with the electron - the speed of the ions has to match up with the speed of the electrons. How does this 'matching up' work if you look at the electrons quantummechanically, so that they don't have a velocity but only an energy and probability?

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    Replies
    1. UnknownFebruary 9, 2017 at 10:12 AM

      the k electron velocity is the key component for this matter. The ion tends to scatter electrons while losing energy. When the ion energy begins to match the k electrons the ion begins to acquire the electrons and change charge. Since the ion changes velocity during energy loss, the overlap occurs. The overlap tends to be greatest at the end of the ion path in the material. Thanks for the question.

      Delete
  6. AnonymousFebruary 8, 2017 at 8:32 PM

    Reviewed and submitted

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  7. UnknownFebruary 8, 2017 at 9:24 PM

    reviewed and submitted quiz 10

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  8. AnonymousFebruary 8, 2017 at 11:08 PM

    Viewed and PDF Quiz 10 submitted on Canvas.

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  9. AnonymousFebruary 8, 2017 at 11:30 PM

    Quiz 10: reviewed and submitted

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  10. UnknownFebruary 9, 2017 at 10:13 AM

    thanks for the comments and PDF quizzes.

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  11. AnonymousFebruary 21, 2017 at 7:50 PM

    lecture reviewed and quiz submitted

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  12. AnonymousFebruary 22, 2017 at 6:13 AM

    lecture reviewed and quiz submitted

    ReplyDelete

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