Emergency Management Accreditation Program (EMAP) seal

Ionizing Radiation Exposure to the U.S. Population

Exposure Category

Exposure Amount

Ubiquitous Background

311 mrem

Internal, inhalation (radon and thoron)

228 mrem

External, space

33 mrem

Internal, ingestion

29 mrem

External, terrestrial

21 mrem

Medical

300 mrem

CT

147 mrem

Nuclear Medicine

77 mrem

Interventional Fluorscopy

43 mrem

Conventional radiography and fluoroscopy

33 mrem

Consumer

13 mrem

Industrial, security, medical, educational & research

0.3 mrem

Occupational

0.5 mrem

Medical, Aviation, Commercial Nuclear Power, Industry and
Commerce, Education and research, Government, DOE, military

 

Annual Total Exposure

620 mrem*

*Information taken from NCRP 160

Average Exposure Doses from single sources

Dose

Weapons fallout

1 mrem/year

Nuclear Power Stations

<0.1 mrem/year

Coal Burning Power Stations

0.165 mrem/year

X-Rays from TV sets @ 1 inch

0.5 mrem/year

Airline Travel @ 39,000 feet

0.5 mrem/year

Natural Gas in home

9 mrem/year

Terrestrial background (Atlantic Coast)

16 mrem/year

Terrestrial background (Rocky Mountains)

40 mrem/year

Cosmic Radiation @ sea level

26 mrem/year

Cosmic Radiation in Denver, Co

50 mrem/year

Radionuclides in the human body (i.e. potassium)

39 mrem/year

Building materials (concrete)

3 mrem/year

Drinking water

5 mrem/year

Chest X-ray (Range 5-20 mrem)

8 mrem/year

Dental X-ray

10 mrem/year

Smoking 1.5 packs of cigarettes daily

1300 mrem/year