There are advanced refining processes such as the Czochralski process than can be used to reduce impurity levels to below the C10100 specification by reducing copper grain density.
3.
Elseth, T ., Nicolaysen, R ., Roberts, D . E . R . Grain Density Correction of the Density Log : A Core-Log Calibration Method for Improved Porosity Prediction in Mineralized Micaceous Sandstone Reservoirs , SPWLA 42 nd Annual Logging Symposium, June 17 20, 2001.
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