X-ray fluorescence, using the fundamental parameters method for matrix correction, is used routinely for quantitative analysis
in our group. The accuracy of this method has been demonstrated with a Nd:YAG (Nd:Y3Al5O12) laser crystal. The neodymium concentration was determined relatively to the yttrium concentration by X-ray fluorescence
using241Am for excitation. The yttrium-aluminum ratio was confirmed by scanning electron microscopy (SEM-EDX). Although there was
a 10% discrepancy for yttrium due to the uncertainty in the neutron capture cross-section, the fluorescence results for aluminum
and neodymium were in very good agreement with neutron activation analysis (NAA) results. Based on this agreement, the Nd:YAG
sample will be used in future NAA calibration measurements.