Barium fluoride

Barium fluoride

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Barium fluoride is also a common, very fast (one of the fastest) scintillator for the detection of X-rays, gamma rays or other high energy particles. One of its applications is the detection of 511 keV gamma photons in positron emission tomography; other material used in this application is eg. bismuth germanate. It responds also to alpha and beta particles, but, unlike most scintillators, it glows in ultraviolet light [M. Laval, Barium Fluoride - inorganic scintillator for subnanoseconds timing, Nuclear Instruments and Methods, 206 :169-176, 1983 ] . It can be also used for detection of high-energy (10-150 MeV) neutrons, and use pulse shape discrimination techniques to separate them from simultaneously occurring gamma photons.

When heated to 500 °C, it gets corroded by water, but in dry environment it can be used up to 800 °C. Prolonged exposure to moisture degrades transmission in the vacuum UV range. It is less resistant to water than calcium fluoride, but is the most resistant of all the optical fluorides to high-energy radiation, though its far ultraviolet transmittance is lower than theirs. It is quite hard, and very sensitive to thermal shock.

Barium fluoride is used as a preopacifying agent and in enamel and glazing frits production. Its other use is in the production of welding agents (an additive to some fluxes, a component of coatings for welding rods and in welding powders). It is also used in metallurgy, as a molten bath for refining aluminium.

References

External links

* [http://physchem.ox.ac.uk/MSDS/BA/barium_fluoride.html MSDS at Oxford University]


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