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ON-SITE LASER-INDUCED BREAKDOWN SPECTROSCOPY (LIBS) FOR POSTDETONATION NUCLEAR FORENSICS IN REAL TIME

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Title
ON-SITE LASER-INDUCED BREAKDOWN SPECTROSCOPY (LIBS) FOR POSTDETONATION NUCLEAR FORENSICS IN REAL TIME
Author
Lee, Chanki
Advisor
Kim, Hee Reyoung
Issue Date
2018-02
Publisher
Graduate School of UNIST
Abstract
If nuclear or radioactive incident occurs, response should be rapidly made to minimize radiological hazard on site, control nuclear or radioactive material, and preserve nuclear forensic evidence to find its origin and production method. Currently, gamma-ray spectroscopy and neutron detection are recommended for on-site analysis of radioactive material in nuclear forensics, while these techniques cannot identify alpha- and beta-emitting isotopes, as well as non-radioactive impurities. To remedy the weakness of such techniques, LIBS could be applied to on-site nuclear forensics, thanks to its speed and adaptability to various circumstances. In this paper, we develop and evaluate theft scenarios of 90Sr, which is pure beta-emitting isotope. We conduct LIBS experiment to analyze selected target materials (SrTiO3, SrF2, and SrCO3) on different substrates (Al, mortar, soil), simulating post-detonation radiological debris in urban areas. Differentiation methods of target materials are found after characterizing LIBS spectra quantitatively, and sensitivity test is conducted by calculating LODs of Sr. The LIBS results are compared with ICP-OES, Raman spectroscopy, and SEM/EDX. Target materials are well differentiated, showing similar tendencies among substrates. LIBS is highly applicable to on-site nuclear forensics, enabling analysis of both radioactive isotopes and nonradioactive impurities, especially when combined with Raman spectroscopy and conventional gamma-ray spectroscopy.
Description
Department of Nuclear Engineering
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