Detection and identification of hydrogen isotopes and their oxides is a key point in emission monitoring of nuclear facilities. Therefore, the establishment of an accurate and stable identification system for hydrogen isotopes and their oxides has important application value in the management of nuclear facilities. Raman spectroscopy is a non-contact and non-destructive component analysis method. This method is based on inelastic scattering of photons generated in the interaction between laser and matter, and can generate different characteristic signal peaks according to the structure of molecular bonds. Therefore, different hydrogen isotopes and their oxides can be qualitatively analyzed by Raman characteristic peaks, and a certain degree of quantitative results can be obtained by signal intensity and spectral peak information. Based on the self-built dual-wavelength laser Raman spectroscopy system (532 nm and 785 nm), the vibration spectra of D-O chemical bonds in heavy water (D2O) were detected and compared, which provided data support for further analysis and identification of nuclear facility emissions.
Laser-induced breakdown spectroscopy (LIBS) is a promising technology for nuclear safeguard because of the advantages of rapid analysis, in situ and real-time detection. The potential application of LIBS is simulatively investigated for continuous uranium emission monitoring during the nuclear accident. The aerosol containing UOx is generated with laser ablation to simulate the uranium emission in laboratory. The laser induced plasma emission in the aerosol has been continuously analyzed with a spectroscopy. The characteristic spectral lines of uranium have been clearly identified. The intensity variation of uranium spectral lines agrees well with UOx particles emission and sedimentation process in aerosol. The potential of LIBS is demonstrated for emergency and continuous emission monitor in nuclear accidents.
Nuclear aerosol simulant generated in laboratory plays a unique role for the development of in-situ monitoring technology of nuclear facility emission. To simulate the emission of the trace uranium aerosol, an aerosol generator based on laser ablation was set up and tested experimentally. It is shown that the concentration of aerosol particles has a linear relationship in the range of 36.28 μg/m3 to 277.13 μg/m3 while the laser intensity keeps above 7.6×106 W/cm2 . The aerosol particle size distribution is stable, while the most particles are inhalable particles based on the measurement of an aerosol spectrometer. The composition is verified with a laser induced plasma spectroscopy. Several spectral lines of uranium have been clearly identified. It is demonstrated that aerosols generated based on laser ablation can simulate nuclear facilities emission effectively. The method will be used in further work to develop direct radioactive aerosol monitoring technology.
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