Arsenic is a natural soluble substance found in the soil, this can then be absorbed by plants thus making them poisonous.
An Englishman W.L.Bragg along with his father W.H.Bragg established X-ray Crystallography, (this discovery was made shortly after Max von Laue discovered X-ray diffraction). Arsenic was one of the crystals they used to diffract the wavelengths.
The part of the body to be X-rayed is placed between this plate and the X-ray tube. If a high voltage is applied to the tube from an Induction Coil, then an image of the bones appears on the arsenic plate.




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