1 / 17

Chapter 19

Chapter 19. Nuclear Chemistry Suroviec Spring 2015. I. Types of Radiation. Radioactivity was discovered in 1896 by Bequerel and further work was done by Curie and Rutherford. A. X. Mass Number. Element Symbol. Z. Atomic Number. A. Isotope review. B. Alpha decay.

damianv
Download Presentation

Chapter 19

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 19 Nuclear Chemistry Suroviec Spring 2015

  2. I. Types of Radiation • Radioactivity was discovered in 1896 by Bequerel and further work was done by Curie and Rutherford.

  3. A X Mass Number Element Symbol Z Atomic Number A. Isotope review

  4. B. Alpha decay • Alpha decay occurs when an unstable nucleus emits a particle composed of 2 protons and 2 neutrons.

  5. C. Beta decay • Beta decay occurs when an unstable nucleus emits an electron

  6. D. Gamma rays • Gamma ray emission is a high energy/short wavelength electromagnetic radiation.

  7. E. Positron emission • Positron emission occurs when an unstable nucleus emits a positron

  8. F. Electron capture • Electron capture involves a particle being absorbed by instead of ejected from an unstable nucleus

  9. II. Kinetics of radioactivity • Radioactivity is the spontaneous emission by unstable nuclei of particle or electromagnetic radiation to get to a stable configuration. • All radioactive decay is first order kinetics

  10. Example • A tree sample has an activity of 10.1 atoms/min of carbon. If a living tree has a decay rate of 15.3 atoms/min, how old is the tree sample?

  11. Example • Americium-241 is used in smoke detectors. Its half life is 432 years. How long will it take for 33% of the Am-241 to decay (in years)?

  12. III. Fission • Enrico Fermi tried to synthesize a new element by bombarding uranium with neutrons

  13. A. Nuclear power • Fission can be used to make a bomb, but in that case all of the energy is released at once.

  14. IV. Nuclear Fusion • Fusion is the combination of 2 nuclei to form a heavier nuclei.

  15. IV. Radiation in everyday life Relative Biological Effectiveness Radiation absorbed dose (rad) 1 rad = 1 x 10-5 J/g of material g-ray = 1 Roentgen equivalent for man (rem) b = 1 1 rem = 1 rad x RBE a = 20

  16. 19_T04.JPG

  17. A. Uses in Medicine • It is immensely useful to use radioactivity in medical diagnosis

More Related