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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 circumstances,
beta-gamma monitoring is the only
means of detecting the contamination.
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