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WW1 Fluoroscopic X RAY Screen.
Early screens like these incorporated a substance which when bombarded by the X-Rays from the tube (Item A0198) powered by the induction coil (Item A0136)interact with atoms on the screen giving their energy to the electrons,(photoelectric effect) a small amount of this energy is given off as light. The rays pass through the subject hitting the screen, dense materials absorb the rays, soft ones do not, causing a shadow effect.
X-Ray tubes also produce Gamma rays, these are harmful causing burns to the skin and internal organs.
The maker of this screen, Frederick.R.Butt, died from the effects of over exposure to radiation on August 1st 1937 at the age of 60, he had been a member of the British Institute of Radiology since 1919.
The pointers on the face of the screen may have been used to locate a foreign body internally.
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- It's made with barium platinocyanide as the fluorescent material that glows under X-rays. They also used calcium tungstate, but that was not so yellow.
.......... Alastair Wright, Sheffield, 20th of September 2013