Abstract
Trace analysis (at fg-level) of radioisotopes requires a considerable push in analytical technology. Among most sensitive are a Time-Resolved Laser-Induced Fluorescence (TRLIF) and Chemiluminescence (TRLIC) methods for detection of elemental compositions and valence states and a Resonance Ionisation Spectroscopy (RIS) in combination with mass spectrometry for isotope composition determination. The radioisotopes of interest in environmental radiochemistry and planetary science and their analysis using TRLIF/TRLIC/RIS are discussed. The aspects of the development of the new technology implementing these methods are also described.
Highlights
The use of laser radiation with tunable wavelength allows [1,2,3] selective excitation of actinide/lanthanide species with subsequent registration of luminescence or chemilumi-nescence for their detection
The behavior of lanthanides/actinides in the environment determined by their molecular speciation, which can be detected by Time-Resolved Laser-Induced Fluorescence (TRLIF)/Time-Resolved Laser-Induced spectroscopy methods (TRLIC)
Combined with modern ion detection techniques e.g. mass spectrometry, the resonance ionisation provides a unique opportunity for study of the isotopes that are of a limited availability similar to those produced in spallation reactions with protons at the isotope separators online e.g. at Isotope Resonance Ionisation Spectroscopy (IRIS) in Gatchina, Russia, or Isotope Separator Online Device (ISOLDE), in CERN, Geneva Switzerland [4]
Summary
The use of laser radiation with tunable wavelength allows [1,2,3] selective excitation of actinide/lanthanide species with subsequent registration of luminescence or chemilumi-nescence for their detection. This research is a result of collaboration across a range of scientific disciplines: nuclear and atomic physics, planetary science and cosmochemistry, earth and environmental science and radiochemistry where expertise in photon science is required for the development of the new state of the art techniques for detection of ultra-trace concentrations of isotopes [5, 6]. These facilities combine resonance ionisation of atoms with pulsed and CW lasers (Nd:YAG, Ar-ion, tunable dye, and TiSa) with a time of flight mass spectrometer/RF qudrupole filter and utilize a state of the art technology available at the host institutions [10,11,12,13].
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