What is radiation?
Radiation is a form of energy. It comes from man-made sources such as x-ray machines, from the sun and outer space, and from some radioactive materials such as uranium in soil.

How can I be exposed to radiation?
Small quantities of radioactive materials occur naturally in the air we breathe, the water we drink, the food we eat, and in our own bodies. Radiation that goes inside our bodies causes what we refer to as internal exposure. The exposure that is referred to as external comes from sources outside the body, such as radiation from sunlight and man-made and naturally occurring radioactive materials.

Radiation doses that people receive are measured in units called "rem" or "sievert." (One sievert is equal to100 rem.) Scientists estimate that the average person in the United States receives a dose of about one-third of a rem per year. Eighty percent of typical human exposure comes from natural sources and the remaining 20 percent comes from artificial radiation sources, primarily medical x-rays.

What are the health effects of exposure to radiation?
Radiation can affect the body in a number of ways, and the adverse health consequences of exposure may not be seen for many years. These adverse health effects can range from mild effects, such as skin reddening, to serious effects such as cancer and death, depending on the amount of radiation absorbed by the body (the dose), the type of radiation, the route of exposure, and the length of time a person is exposed. Exposure to very large doses of radiation may cause death within a few days or months. Exposure to lower doses of radiation may lead to an increased risk of developing cancer or other adverse health effects.

How can I protect myself from radiation?
The three basic ways to reduce your exposure are through
TIME:Decrease the amount of time you spend near the source of radiation.
DISTANCE:Increase your distance from a radiation source.
SHIELDING:Increase the shielding between you and the radiation source. Shielding is anything that creates a barrier between people and the radiation source. Depending on the type of radiation, the shielding can range from something as thin as a plate of window glass or as thick as several feet of concrete. Being inside a building or a vehicle can provide shielding from some kinds of radiation.

Where can I get more information about radiation?
More information can be obtained from the following U.S. government sources:

The Environmental Protection Agency

The Nuclear Regulatory Commission can be reached at (301) 415-8200

The Federal Emergency Management Agency (FEMA) can be reached at (202) 646-4600.

The Radiation Emergency Assistance Center/Training Site (REAC/TS) can be reached at (865) 576-3131 (ask for REAC/TS).

The U.S. Department of Energy (DOE) can be reached at 1-800-dial-DOE.

Radiation and Health Effects

Radiation is a form of energy. Radiation comes from man-made sources such as x-ray machines, from the sun and outer space, and from some radioactive materials such as uranium in soil. Small quantities of radioactive materials occur naturally in the air we breathe, the water we drink, the food we eat, and even in our own bodies. Radiation that goes inside our bodies causes what we refer to as internal exposure. External exposure is from radiation from sources outside our body, such as radiation from sunlight and man-made and naturally occurring radioactive materials. Radiation doses that people receive are measured in units called “rem” or “sievert.” (One sievert is equal to 100 rem.) Scientists estimate that the average person in the United States receives a dose of about one-third of a rem per year. Eighty percent of typical human exposure comes from natural sources and 20 percent comes from artificial radiation sources, primarily medical X-rays Health Effects of Radiation Exposure Radiation affects the body in different ways, but the adverse health consequences of exposure may not be seen for many years. Adverse health effects range from mild effects, such as skin reddening, to serious effect such as cancer and death. These adverse health effects are determined by the amount of radiation absorbed by the body (the dose), the type of radiation, the route of exposure, and the length of time a person is exposed. Acute radiation syndrome (ARS), or radiation sickness, is usually caused when a person receives a high dose of radiation to much of the body in a matter of minutes. Survivors of the Hiroshima and Nagasaki atomic bombs and firefighters responding to the Chernobyl nuclear power plant event in 1986 experienced ARS. The immediate symptoms of ARS are nausea, vomiting, and diarrhea; later, bone marrow depletion may lead to weight loss, loss of appetite, feeling like you have the flu, infection, and bleeding. The survival rate depends on the radiation dose. For those who do survive, full recovery takes from a few weeks to 2 years. Children exposed to radiation may be more at risk than adults. Radiation exposure to the unborn child is of special concern because the human embryo or fetus is extremely sensitive to radiation. Radiation exposure, like exposure to the sun, is cumulative. Protecting Against Radiation Exposure

The three basic ways to reduce radiation exposure are through:
TIME: Decrease the amount of time you spend near the source of radiation.
DISTANCE: Increase your distance from a radiation source.
SHIELDING: Increase the shielding between you and the radiation source. Shielding is anything that creates a barrier between people and the radiation source. Depending on the type of radiation, the shielding can range from something as thin as a plate of window glass or as thick as several feet of concrete. Being inside a building or a vehicle can provide shielding from some kinds of radiation. Other Sources of Information about Radiation

The Environmental Protection Agency counterterrorism programs
The Nuclear Regulatory Commission can be reached at (301) 415-8200.
The Federal Emergency Management Agency (FEMA) can be reached at (202) 646-4600.
The Radiation Emergency Assistance Center/Training Site (REAC/TS) can be reached at (865) 576-3131 (ask for REAC/TS).
The U.S. National Response Team.
The U.S. Department of Energy (DOE) can be reached at 1-800-dial-DOE.
The state radiation control director can be found by contacting
The Conference of Radiation Control Program Directors (CRCPD) at (502) 227-4543.