In this work, a gamma ray Compton backscatter technique is used for imaging defects and
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diameters and at various depths from one side of the object. The scattered radiation was
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pipes with walls more than 15 mm thick. Low activity sources of 108 Bq (a few mCi) were
used, and the dose rate near the surface is four orders of magnitude lower than conventional
industrial radiography sources, permitting it to be much safer.
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