I think of the non-ionizing range, e.g. Terahertz or Radio. Limestone clearly is transparent to x-ray or gamma but thats not what i am asking for. Natural to low ranges of porosity/water content assumed.

  • 1
    $\begingroup$ What are you trying to do? $\endgroup$
    – Gimelist
    Aug 6 '18 at 10:38

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