Measuring accurate optical constants of uranium minerals for use in optical modeling of infrared spectra

T. L. Myers; B. M. DeVetter; D. L. Saunders; C. E. Lonergan; M. O. Yokosuk; B. E. Bernacki; A. Bautista; T. J. Johnson

doi:10.1117/12.2588321

12 April 2021 Measuring accurate optical constants of uranium minerals for use in optical modeling of infrared spectra

T. L. Myers, B. M. DeVetter, D. L. Saunders, C. E. Lonergan, M. O. Yokosuk, B. E. Bernacki, A. Bautista, T. J. Johnson

Proceedings Volume 11749, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXII; 117490T (2021) https://doi.org/10.1117/12.2588321
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Knowledge of the bulk optical constants n and k of solids or liquids allows researchers to accurately predict the absorption, reflection, and scattering properties of materials for different physical forms. Indeed, chemically complex materials such as minerals can have an almost limitless variety of morphologies, particle sizes, shapes, and compositions, and the optical properties of such species can be predicted if the optical constants are known. For species such as minerals, there can be additional challenges due to e.g. hydration or dehydration during the course of the optical constants measurement. Here, we describe the protocols to obtain the bulk optical constants n and k of uranium-bearing minerals and ores such as uraninite or autunite. If quality n and k data are at hand, the (infrared) reflectance spectra can be predicted for different particle sizes and morphologies and the modeling results for various scenarios can be derived.

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Citation Download Citation

T. L. Myers, B. M. DeVetter, D. L. Saunders, C. E. Lonergan, M. O. Yokosuk, B. E. Bernacki, A. Bautista, and T. J. Johnson "Measuring accurate optical constants of uranium minerals for use in optical modeling of infrared spectra", Proc. SPIE 11749, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXII, 117490T (12 April 2021); https://doi.org/10.1117/12.2588321

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