Raman spectroscopy is a kind of molecular fingerprint spectroscopy,and it has the advantages of non-destructive,high resolution,high sensitivity and non-contact.Therefore,Raman spectroscopy is very suitable for the detection of corrosion products of highly radioactive and expensive nuclear materials.How-ever,the existing commercially available Raman spectroscopy instruments can hardly realize the on-site de-tection of corrosion products of nuclear materials with weak signals.The major problems are reflected in the low sensitivity of portable Raman spectrometers and inconvenient movement of desktop micro-Raman spectrometers.For this reason,a portable Raman spectrometer was developed in this study through a se-ries of improvement measures based on independently designed reflective probe,high luminous flux spec-trometer,scientific level and high deep cooling CCD.The sensitivity was significantly improved,and meanwhile,the spectral background was greatly reduced.Thus,the shortcomings of portable Raman spectrometer in weak detection signals were overcome.The developed spectrometer was applied for the de-tection of certified reference materials(UO2,U4O9 and U3O8)and mixture(U3O8 and UO2)of uranium corrosion products.The Raman spectra obtained had low background and clear characteristic peaks,which could detect the signals of corrosion products(U3O8)of nuclear materials with 5％content(mass frac-tion).The uranium materials in three corrosion states were tested.It was found that the different corro-sion products could be distinguished and identified.This study provided reference for the scientific under-standing of corrosion mechanism and behavior of uranium materials.
nuclear materialcorrosion productportable Raman spectrometerdevelopment and applica-tion
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