What is the error arising from counting statistics using the gamma-ray counting for the concentration determination?

For Potassium concentration of 1%, for a typical counting time of 10 hours, the 1 sigma error range is 58% to 3% for a sample range of 10 g to 1000 g; for a counting time of 100 hours, the 1 sigma error range is 18% to 1% for a sample of 10 g to 100 g For Uranium and Thorium, for a concentration of 1 ppm, for a typical counting time of 10 hours, the 1 sigma error is n the range of 27% to 18% for a sample range of 400 g to 1000 g; for a counting time of 100 hours, the 1 sigma error is better than 15% for U and better than 15% for Th. More.

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