New wardrobe against X-rays.
Manufacturers of the protective garments typically combine about 6 kilograms of lead powder with about 3 kilograms of rubber or vinyl per square meter of material. Yaffe notes, however, that lead absorbs some kinds of X-rays less well than others. By mixing in barium and tungsten, which effectively absorb those types of X-rays, "you get better absorption over a whole range of energies," he explains. The material thus shields more efficiently, offering the same protection as an all-lead apron but with 20 to 30 percent less weight, he says.
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|Title Annotation:||using barium and tungsten powders to make lighter X-ray shields|
|Date:||Jul 6, 1991|
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