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Nuclear density gages (Gumsmn)

Instruments that measure in-place hot mix asphalt density using gamma radiation. Gages usually contain a small gamma source (about 10 mCi) such as Cesium-137 on the end of a retractable rod. (Source: http://training.ce.washington.edu/WSDOT/Modules/07_construction/nuclear_gauge.htm)
Broader Term
Instruments for measuring density (Gumsm)
Related Terms (Hierarchical)
Densitometers (Gumsmd)