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DOE-HDBK-1113-98
Module 104 Internal Dose Control
Lesson Plan
Instructor's Notes
Alpha particles are highly charged and
will only travel about 2 inches in air.
Alpha particles are also stopped by the
dead layer of skin. This means that
alpha particles external to the body are
not a health concern. It also means that
alpha particles are hard to detect
because the detector must be close to
the source of the material emitting the
alpha particle.
There are many detector types
available for detecting alpha
contamination. Two of the most
commonly used types are scintillation
detectors and gas proportional
counters. A thin window Geiger-
Mueller (GM) detector, such as a
pancake probe, will also detect a small
portion of the alpha radiation emitted.
52


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