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Identification of Beta-Tungsten in a Heavily Blackened, Burned Out, Vehicle Headlamp by X-Ray Powder Diffraction

Abstract A headlamp of a vehicle involved in an accident was examined in order to assess whether or not it was lit during the collision. In the examination it was found that the headlamp bulb was heavily blackened in an unusual way and its two filaments burnt out. Applying X-ray powder diffraction by diffractometer, the black deposit present in the bulb was identified to consist of a mixture of β-tungsten and the ordinary α-tungsten.