1 / 12

CE 3231 - Introduction to Environmental Engineering and Science

CE 3231 - Introduction to Environmental Engineering and Science. Readings for Next Class :. O hio N orthern U niversity. Chemistry, Microbiology & Material Balance. Introduction. Water & Air Pollution. Env Risk Management. Nuclear Chemistry

hiroko
Télécharger la présentation

CE 3231 - Introduction to Environmental Engineering and Science

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. CE 3231 - Introduction to Environmental Engineering and Science Readings for Next Class: Ohio Northern University Chemistry, Microbiology & Material Balance Introduction Water & Air Pollution Env Risk Management Nuclear Chemistry Radiation occurs naturally all around us. In this class we will cover the three types of radiation along with nuclear fission (used to make power). We will take a look at calculating half-lives and also the most common units to describe radiation dosing.

  2. Lecture 9Nuclear Chemistry(Chemistry VI)

  3. Arsenic in Bangladesh Review

  4. Radiation • Three types released from unstable nucleus alpha 2 protons, 2 neutrons beta electron or positron gamma electromagnetic radiation

  5. Ionizing Radiation a, b and g carry enough kinetic energy to liberate an e- from an impacted particle… ..therefore shielding is important! A note about x-rays: X-rays are ionizing radiation (really like gamma rays), but they are generated by electron transitions rather than from an unstable nucleus

  6. Radiation Units • curie (Ci) decay • becquerel (Bq) decay • roentgen (R) ionizations • rad (radiation absorbed dose) dose • rem (roentgen equivalent man) equivalent dose

  7. Nuclear Fission Include: Ce-137 Sr-90 I-131 Reaction gives off particles with kinetic energy. The KE builds within the uranium fuel pellet resulting in heat gain within the pellet. The heat is transferred to water through the fuel rod (metal tube)

  8. Making Uranium Pellets Uranium Mining and Milling

  9. Making Power How a Nuclear Power Plant Works

  10. Managing Radioactive Waste Wastes

  11. Radioactive Decay – The challenge Radiation fragments in waste (Ce-137, Sr-90, I-131) will continue to give off ionizing radiation and must be safely shielded and stored for a very long time. Estimated by: N = Noe-0.693t/t where: N = final number of atoms or curies No = initial number of atoms or curies t = time t = half-life of atom

  12. Radioactive Decay – The challenge ElementHalf Life Ce-137 30.17 years Sr-90 28.79 years I-131 8.01 days

More Related