A manual of practical medical electricity : the Röntgen rays and Finsen light . The second method of ascertaining the presence ofX rays is to make use of fluorescence. Various salts will light up with a visible glow whenexposed to the X radiation. Of these salts, the platino-cyanides of barium and of potassium and tungstate ofcalcium are about the best, and rank in the order in whichthey are written above. A piece of cardboard or fabric coated with one of constitutes a fluorescent screen. A rough screen can easily be made by gumming one sideof a piece of cardboard and by siftin
A manual of practical medical electricity : the Röntgen rays and Finsen light . The second method of ascertaining the presence ofX rays is to make use of fluorescence. Various salts will light up with a visible glow whenexposed to the X radiation. Of these salts, the platino-cyanides of barium and of potassium and tungstate ofcalcium are about the best, and rank in the order in whichthey are written above. A piece of cardboard or fabric coated with one of constitutes a fluorescent screen. A rough screen can easily be made by gumming one sideof a piece of cardboard and by sifting through a piece ofmuslin on to the wet surface one of these substances inthe crystalHne condition. It is, however, difficult to getit evenly enough laid on to obtain an equally illuminatedsurface. Good screens can be bought from the philo-sophical instrument makers, but are expensive, becausethe platino-cyanide salts are dear. The tungstate screensare much cheaper, but do not illuminate so brightly. Thedouble fluoride of ammonium and uranium can also be RoNTGEN X Rays 339. Fig. 152.—Broken Radius. (An old injury to wrist, photographedthrough the sphnts, and showing faulty position of fragments.)
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectro, bookyear1902
