To measure the void height which underneath steel plate (RT technique)

Dear sir,

Now we need to measure the height of void underneath 40mm thk. steel plate. The void is between steel plate and concrete (only the side of steel plate accessible). pls refer the sketch below

 

What technique can be used to fit for the purpose? how about the backscatter imaging?

Is there any portable NDE euipment available to implement the inspection?

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