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3.2 Evaluating a Neutron Activation Analysis
KAYZERO can be used for NAA data obtained using properly calibrated
gamma-ray spectrometers and nuclear reactors (see VADE MECUM FOR k0USERS).
In this manual the NAA data of an actual analyzed sample are used to
explain the use of KAYZERO. The sample and a monitor were irradiated in
channel Y4 of the BR1 reactor in Mol, Belgium. The sample and monitor were
measured at DSM Research using detector 2, a properly calibrated HighPurity Germanium detector with a dual spectrum LFC system. The peak
locations and peak areas were computed using Sampo-90.
The flux parameters, f and α, for channel Y4 of the BR1 were predetermined
and are assumed to be constant over time.
After the calibration of the detector all relevant data, the reference efficiency,
the effective solid angles, peak-to-total-ratios and coincidence correction
factor data were stored in the right format at the right locations (see Appendix
2).
The KAYZERO operating procedure (see Appendix 3) can be summarized as
follows:
enter the measurement data of the monitor(s) in KAYZERO;
check the spectra for split-up peaks (new option: Peak summation);
to determine Fc, calculate the flux parameters, f and α (using a gold/
zirconium monitor) or use predefined values of f and α and e.g. a gold
monitor for determination of Fc (only if the parameters f and α can be
considered to be constant);
print the flux parameters;
enter the measurement data of the sample and the flux parameters in
KAYZERO;
calculate the element concentrations;
check and correct (for blank concentrations, reaction interferences and
outliers) the results (new option);
print the element concentrations.
Chapter 3: Analysis Evaluation
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