Neutron Activation Analysis
Prompt Gamma Neutron Activation Analysis (PGNAA) is a quantitative technique used to perform highly sensitive multi-element analysis of major, minor, and trace elements. PGNAA converts stable isotopes to radioactive isotopes through neutron bombardment, creating artificial radioisotopes with known radioactive emissions and decay times.
Following radioactive conversion, NAA then determines the concentration of elements based on the known radioactive emissions of the sample. The unique characteristics of the energy released during radioactive decay indicate the level of concentration. This method allows for isolated element sampling, as the chemical form of the sample is disregarded during the testing process.
Neutron Activation Analysis produces the most consistent results of all non-destructive testing methods. However, the accuracy of PGNAA is largely dependent on the quality of the radiation source used. QSA radiation sources have exacting purity requirements that allow for the most consistent spectrum.
PGNAA Applications
- Coal Scanning – Accurate and continuous monitoring of the standard coal analysis Ash, Sulfur, Specific Energy / Heating Value and Moisture.
- Mineral scanning – Units are currently installed in iron ore, manganese and copper mining and processing operations to provide real time, full stream analysis for process control
- Cement Aggregate Scanning – minute-by-minute elemental analysis of bulk material passing through it on a standard conveyor belt helps to improve the consistency of cement blends increasing structural integrity.
Sources:
Contact QSA for additional information on sealed sources used in neutron activation analysis.