Abstract
Based on the laser resonance ionization mass spectrometry (LRIMS) developed in the laboratory, a preliminary method was established to determine Pu isotope ratios. A three-color-three-photon resonance ionization scheme was confirmed, and the laser wavelengths of each excitation/ionization step were λ1 = 586.654 nm, λ2 = 606.181 nm and λ3 = 642.722 nm. The selective ionization of 238Pu/238U was realized by testing the Pu and U mixed sample, a selectivity ratio of over 107 was obtained. More effective electrothermal atomization of Pu was implemented by loading graphene oxide solution on the Pu sample surface, and the total detection efficiency of ∼40 ng Pu sample was above 3 × 10−4, which was three orders of magnitude higher than the efficiency of the unloaded graphene oxide solution Pu sample. Results showed that the relative standard deviation of 238Pu/239Pu ratio was ∼0.20%, indicating that LRIMS could effectively avoid the isobaric interference of 238U faced by other commercial mass spectrometers such as TIMS and ICP-MS, and could achieve precise measurement of 238Pu/239Pu ratio.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call