Naturally occurring sources of radiation are cosmic radiation from space or radioactive materials in soil or building materials. If the substance is radioactive, you may also be exposed to radiation if you are near it.Įxternal exposure to radiation may occur from natural or man-made sources. You may be exposed by breathing, eating, or drinking the substance, or by skin contact. You are exposed to a substance when you come in contact with it. This release does not always lead to exposure. When a substance is released from a large area, such as an industrial plant, or from a container, such as a drum or bottle, it enters the environment. This information is important because exposure to this substance may harm you and because these sites may be sources of exposure. As more sites are evaluated, the sites at which cesium is found may increase. However, the number of sites evaluated for cesium is not known. It was reported that 134Cs (radioactive) has been found in at least 3 of the 1,636 current or former NPL sites and 137Cs (radioactive) has been detected in at least 23 of the 1,636 current or former NPL sites. Stable (not radioactive) cesium ( 133Cs) has been identified in at least 8 of the 1,636 hazardous waste sites that have been proposed for inclusion on the EPA National Priorities List (NPL) (HazDat 2003). These sites make up the National Priorities List (NPL) and are the sites targeted for long-term federal cleanup activities. The Environmental Protection Agency (EPA) identifies the most serious hazardous waste sites in the nation. This public health statement tells you about cesium and the effects of exposure. For more information, call the ATSDR Information Center at 1-80. The effects of exposure to any hazardous substance depend on the dose, the duration, how you are exposed, personal traits and habits, and whether other chemicals are present. This information is important because this substance may harm you. It is one in a series of Public Health Statements about hazardous substances and their health effects. This Public Health Statement is the summary chapter from the Toxicological Profile for cesium.
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