Abstract: A method of maintaining measurement accuracy of specific constituents in prompt gamma neutron activation analyzers in a flow of bulk material having a known range of flow rates. The method comprises the steps of providing a plurality of samples of the bulk material for insertion into the analyzer in geometries and quantities referred to as loading profiles. Each of the loading profiles is inserted into the analyzer and measured long enough to yield a measurement uncertainty that is small compared to the observed differences in analysis results from one loading to another. The results are recorded and differences computed as measured errors for subsequent mathematical generation of the expected error at any loading value.

Abstract: A method of maintaining measurement accuracy of specific constituents in prompt gamma neutron activation analyzers in a flow of bulk material having a known range of flow rates comprising of the steps of providing a plurality of samples of the bulk material in the form of standard geometric units, each said unit having the same concentration of the specific constituent to be measured and said units in a form that can be arranged to pass through the analyzer in the same manner as the bulk material; for insertion into the analyzer in geometries and quantities referred to as loading profiles that range from the smallest to the largest flow rates to be expected with the specific bulk material and the specific analyzer, successively inserting each of the loading profiles into the analyzer and measuring long enough to yield a measurement uncertainty that is small compared to the observed differences in analysis results from one loading to another, and recording these results and computing the differences of the mea