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Isotope dilution gamma spectrometry (IDGS) for determination of the Pu concentration, using high resolution gamma-ray spectrometry (HRGS) in the 40–150 keV energy range, is developed and described. The methodology involves purification of Pu by an anion exchange procedure, followed by the determination of Pu isotopic composition using HRGS. For isotope dilution, a pre-calibrated power reactor grade Pu (∼ 70 at. %  239 Pu) solution from an Indian PHWR was used as a spike for research reactor grade Pu (∼ 95 at. %  239 Pu) samples and  vice versa . Changes in  240 Pu/ 239 Pu (45.24 keV/51.62 keV) and  241 Pu/ 239 Pu (148.57 keV/129.29 keV) activity ratios in the spiked samples were determined by gamma spectrometry. Using the atom ratios calculated from the measured activity ratios, the concentration of Pu in the sample was calculated using two different efficiency calibration methods. The isotopic composition and concentration of Pu samples both from power reactor and research reactor grade agreed well with the values obtained by isotope dilution-thermal ionization mass spectrometry. The present method also shows the superiority of using the  240 Pu/ 239 Pu atom ratio against the  241 Pu/ 239 Pu atom ratio in IDGS with respect to the accuracy and precision.

Isotope dilution gamma spectrometry for Pu using low energy photons