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This section provides a brief discussion of general radiation
safety. The exposure profiles for the Model 3241 gauge are also
included, along with a discussion of the source encapsulation.
Types of Radiation
The radioactive source in the Model 3241 Series produce three
types of radiation:
♦ Alpha Particles
♦ Photons
♦ Neutrons
Alpha particles are stopped by the source capsule. Only the
photon and neutron radiation contribute to the occupational
radiation exposure.
Photon radiation is electromagnetic radiation, as are x-rays,
radio waves, and visible light. Visible light and photons have no
mass, a zero electrical charge and travel at the speed of light.
Photons are energetic and penetrating. Dense materials provide
the best shielding against photon radiation.
Neutron radiation allows measurement of the asphalt content in
a material because the neutrons are slowed by collisions with
materials containing hydrogen atoms. Neutrons have a neutral
charge and are very penetrating.
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