CPN MC3 ELITE - Natural Radiation Exposure Levels

InstroTek
54
Natural Radiation
The best way understand the Rem is to know it relates to our
everyday life. Annually humans are exposed 100 to 300 mRem
(milliRem) per year from natural sources:
Source
Description
Annual Dose
Cosmic
From the sun and other
space sources and their
reaction with the earth’s
atmosphere. It increases
1 mRem for every 100 ft.
of elevation above sea
level.
- San Francisco (Sea
Level)
- Denver (5,280 ft.)
- 44 mRem
- 97 mRem
Earth
From the natural
radioactive materials in
the ground
-15 mRem
Housing
From the materials used
to build our homes and
work places:
- Stone house
- Brick or concrete
- Wood house
- 50 mRem
- 45 mRem
- 35 mRem
Living
- Eating/Drinking/
Breathing
- Body
- Television (2 hours per
day)
- Jet plane trip (3000 mile
flight)
- 25 mRem
- 15-20 mRem
- 0.3 mRem
- 2 mRem