Showing posts with label BACKSCATTER GAUGE. Show all posts
Showing posts with label BACKSCATTER GAUGE. Show all posts
Thursday, 12 November 2015
BACKSCATTER GAUGE
BACKSCATTER GAUGE - (CIA) Gamma ray device used to measure thickness of walls when drilling for covert microphone/device placement to avoid compromise from unexpected breakthrough. Adapted from industrial technology used to measure thickness of paper. 1970's.
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