is3_112 - Radiological Emergency Management Independent...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Radiological Emergency Management Independent Study Course 5-4 Terrestrial Radiation Terrestrial radiation accounts for over three-quarters of the overall dose from natural sources of radiation. Three main types of terrestrial radiation account for most of this: 1. Rocks and minerals. 2. Radon and its decay products. 3. Activity in food. Rocks and Minerals The main sources of radiation in rocks are Potassium-40 and the two series of radioactive elements that come from the decay of Uranium-238 and Thorium-232. Uranium-238 is dispersed throughout the soil at various low levels of concentration. Where the concentration exceeds 1,000 ppm, it may be economic to mine the ore to make fuel for nuclear reactors. Thorium-232 is similarly dispersed in soil. Potassium-40 constitutes a significant part of elemental potassium which makes up 2.4 percent of the earth’s crust. Concentrations of minerals that collect in ash from the burning of coal for energy are sometimes quite high in radioactivity.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern