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Appendix C

The Results Tables are available in Portable Document Format (pdf).  You will need the Adobe Acrobat Reader to read or print PDF files.

Table C-1. Weekly Gross Alpha and Gross Beta Concentrations in Air PDF file download
Table C-2. Weekly Iodine-131 Activity in Air PDF file download
Table C-3. Quarterly Cesium-137, Strontium-90, and Actinide Concentrations in Composite Air Filters PDF file download
Table C-4. Tritium Concentrations in Atmospheric Moisture PDF file download
Table C-5. Monthly and Weekly Tritium Concentrations in Precipitation PDF file download
Table C-6. Weekly and Monthly Iodine-131 and Cesium-137 Concentrations in Milk PDF file download



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Radiation in Our World

Radiation has always been a part of the natural environment in the form of cosmic radiation, cosmogenic radionuclides [carbon-14 (14C), Beryllium-7 (7Be), and tritium (3H)], and naturally occurring radionuclides, such as potassium-40 (40K), and the thorium, uranium, and actinium series radionuclides which have very long half lives. Additionally, human-made radionuclides were distributed throughout the world beginning in the early 1940s. Atmospheric testing of nuclear weapons from 1945 through 1980 and nuclear power plant accidents, such as the Chernobyl accident in the former Soviet Union during 1986, have resulted in fallout of detectable radionuclides around the world. This natural and manmade global fallout radioactivity is referred to as background radiation. MORE

Radiation Exposure and Dose

The primary concern regarding radioactivity is the amount of energy deposited by particles or gamma radiation to the surrounding environment. It is possible that the energy from radiation may damage living tissue. When radiation interacts with the atoms of a given substance, it can alter the number of electrons associated with those atoms (usually removing orbital electrons). This is called ionization. MORE