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DOE-HDBK-1113-98
Module 104 Internal Dose Control
Lesson Plan
Instructor's Notes
ii.
Beta-Gamma Monitoring
Proportional counters and GM
detectors are well suited for
detecting beta-gamma radiation
emitted by radioactive decay
products in the uranium chain.
Beta-gamma radiation travels
further than alpha radiation and is
easier to detect. For natural,
depleted, and lower levels of
enriched uranium, the ability to
measure uranium by detecting the
beta-gamma radiation from the
uranium and its radioactive decay
products is about five times more
sensitive than by alpha monitoring
alone.
Many surfaces that could be
contaminated are porous. If the
uranium contamination is in the
pores of the material or the surface
of the material is wet, the alpha
radiation will be blocked. Under
these ci rcumstan ces, bet a-gamma
monitoring is the only means of
detecting the contamination.
54


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