Assay pills are provided in 1g pills. These are of known grade and are to be inserted into a bulk lot of blank material (available from Geostats if required).
The amount of blank material determines the expected grade of the "dosed" sample. Click here to download an Excel file to assist you in data recording.
Results on the "dosed" samples can be assessed using a normal control chart. The target value is the grade of the pill divided by the mass of the blank in grams, and the standard deviation is 0.5% of the target. However, this variance will vary depending on the blank material used and the weighing of each blank sample.