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Rock 226Ra(Bq/kg)
Granite, normal (화강암) 25 - 80
Granite, Uranium rich 100 - 500
Gneiss, sedimentary (편마암) 25 - 125
Gabbro, dolerite (반려암) 1 - 25
Sandstone (사암) 1 - 60
Limestone (석회암) 5- 40
Shale (혈암, 셰일) 10 - 125
Black Shale (흑암셰일) 10 - 2,000
Alum Shale (백반혈암) 125 - 4,300
Uranium ore (우라늄광) 12,000 - 25x105
Durrani, S.A and Ilic,R., 1997 “Radon measurements etched by track detectors” World Scientific. p387
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