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A sudden release of UF6 inside a building or to the atmosphere could conceivably cause undesirable health effects to workers and the public in general, mainly associated with the exposure to hydrolysis products HF and UO2F2. Although the hydrolysis reaction of UF6 is fast, after escaping of UF6 into the atmosphere, besides HF and UO2F2, UF6 may also be found in the atmosphere. This chapter proposes a real-time technique to provide information to technical personnel and facility operators on the atmospheric release of UF6 to ensure that the workers, the public, and the environment are adequately protected. The system comprises a combined differential absorption lidar (DIAL) and Raman lidar to detect gaseous UF6 and HF, simultaneously. The DIAL provides information on UF6 concentration using a frequency-quadrupled Nd:YAG laser at 266 nm as the off-wavelength and a Nd:YAG-pumped Coumarin 450 dye laser using a Littrow grating mounting operating in the frequency doubled at 245 nm as the on-wavelength. Recording Raman scattering of molecular HF at wavelength of 297.3 nm (with Raman frequency shift of 3959 cm ) is a versatile technique to identify HF as a probe for real-time detection and localization of UF6 leaks.

Remotely Monitoring Uranium-Enrichment Plants with Detection of Gaseous Uranium Hexafluoride and HF Using Lidar