Selective Ionization of Trace Plutonium from Uranium-Plutonium Mixture by Laser Resonance Ionization Mass Spectrometry

SHEN Xiao-pan; LI Zhi-ming; ZHAI Li-hua; DENG Hu; XU Jiang; WEI Guan-yi

doi:10.7538/zpxb.2013.34.05.0269

Journal of Chinese Mass Spectrometry Society > 2013 > 34(5): 269-272. > DOI: 10.7538/zpxb.2013.34.05.0269 CSTR: 32365.14.zpxb.2013.34.05.0269

SHEN Xiao-pan, LI Zhi-ming, ZHAI Li-hua, DENG Hu, XU Jiang, WEI Guan-yi. Selective Ionization of Trace Plutonium from Uranium-Plutonium Mixture by Laser Resonance Ionization Mass Spectrometry[J]. Journal of Chinese Mass Spectrometry Society, 2013, 34(5): 269-272. DOI: 10.7538/zpxb.2013.34.05.0269

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Selective Ionization of Trace Plutonium from Uranium-Plutonium Mixture by Laser Resonance Ionization Mass Spectrometry

Northwest Institute of Nuclear Technology, Xi’an 710024, China

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Abstract

Based on the laser resonance ionization mass spectrometer (LRIMS) developed in the laboratory, a preliminary method was established to determine plutonium isotope ratios. Through scanning the wavelength of ionizing laser, a three-color-three-photon resonance ionization scheme for plutonium with greater ionization section was obtained. A uranium plutonium mixture was prepared to be used as a simulant sample, and the plutonium isotope ratio in the sample was determined. Results show that the relative standard deviation of ²⁴⁰Pu/²³⁹Pu isotope ratio is 1.1%, and the element selectivity of plutonium to uranium is better than 5×10⁶. This work indicates that LRIMS can effectively avoid the isobaric interference and strong-peak-tail interference from other elements.
- laser resonance ionization mass spectrometry(LRIMS),
- plutonium,
- isobaric interference,
- element selectivity

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