The butler hill and breadtray granites also contain anomalous amounts averaging 6 2 and 5 6 ppm u and 23 5 and 20 5 ppm th respectively. However some large bodies of igneous rock contain higher than average amounts of uranium and thorium. The most radioactive is the graniteville granite which contains an average of 16 9 ppm u and 42 6 ppm th.
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