Source Your Average Yearly Dose (mrem) Pie Charts of Estimated Total Yearly Dose


Have you had an X-ray, Medical Exam or Procedure in the last 12 months?

Terrestrial (from the ground)

What region of the US do you live in?

Cosmic Radiation (from space)

What is the elevation exit disclamer(in feet) of your town?

Cosmic radiationHelpCosmic radiationconsist of extremely energetic particles that strike the Earth's atmosphere from space. The annual dose of cosmic radiation that people receive depends on elevation. The higher the altitude, the higher the dose. That is why those living in Denver, Colorado (altitude of 5,280 feet) receive a higher annual radiation dose from cosmic radiation than someone living at sea level (altitude of 0 feet). at sea level - more info 26 mrem

Internal Radiation (in your body)

Internal radiation from food and water (e.g., potassium) 40 mrem
Do you have porcelain crowns or false teeth?

Travel Related Sources

How many miles have you traveled by jet this year? (1 mrem per every 1000 miles)
How many times did you go through a screening machine exit disclamer at the airport over the last year? (.003 average mrem each)
Are x-ray luggage inspection machines used at your airport?
Do you use gas lantern mantles when camping?

Other Sources

If you are a radiation workerHelpradiation workerA radiation worker is an individual whose job assignment requires work on, with, or in the proximity of radiation producing machines or radioactive materials and has the potential of being exposed to at least 100 mrem a year from occupational sources., enter your exposure here. - more info
How many packs of cigarettes do you smokeHelpsmokeWhere do the radionuclides in tobacco come from? The fertilizer that farmers use contains the naturally occurring radionuclide, radium. Radium radioactively decays to release radon, which rises from the soil around the plants. The radon and its decay products cling to the sticky hairs (trichomes) on the bottom of tobacco leaves as the plant grows. The decay products include radioactive elements lead-210 and polonium-210 and cigarettes made from this tobacco still contain these radioactive elements, which emit mostly alpha and gamma radiation. The radioactive particles settle in smokers lungs, where they build up as long as the person smokes and over time, the radiation can damage the lungs and help cause lung cancer per day? (0.49 mrem per pack)
Weapons Test FalloutHelpWeapons Test FalloutDetonating nuclear weapons above ground sends radioactive materials into the atmosphere from the ground level up to as high as 50 miles. Large particles fall back near the explosion site, but lighter particles and gases travel into the upper atmosphere. They can circulate around the world for years, or even decades, until they gradually settle out or are brought back to the surface by precipitation. - more info 1 mrem
Do you live in a stone, brick, or concrete building?
Do you wear a luminous wristwatch?
Do you have a smoke detector in your home?
Do you live within 50 miles of a nuclear power plant?
Do you live within 50 miles of a coal fired power plant?


EPA estimates that about 21,000 lung cancer deaths each year in the U.S. are radon-related. Exposure to radon is the second leading cause of lung cancer after smoking. For never-smokers, it is the leading cause of lung cancer.

For most people, radon is the single greatest environmental source of radiation exposure. Learn more about radiation sources and doses, including radon. For smokers, the risk of lung cancer is significant due to the combined effects of radon and smoking.

Have you tested your home for Radon? Test Your Home for Radon


Your result is only an estimate. The dose calculator does not provide precise individual dose calculations.

The values used in the calculator are based on general averages, and should be used to compare estimated doses from common sources of radiation. For most people, radon is the single greatest environmental source of radiation exposure. Testing is the only way to know if your home has elevated radon levels. Learn more about testing your home for radon.