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Articles
X-ray Fluorescence: Detection of Lead in Wall Paint
1 Institute of Environmental Medicine, New York University Medical Center, New York 10016
An instrument has been developed for the in situ determination of lead on painted surfaces. It utilizes, as a source of gamma rays, radioactive cadmium-109 and its daughter silver-109 (metastable) to excite the K series x-rays of lead, and a solid-state, lithium-drifted germanium detector. The device, which is capable of detecting 0.26 milligram of lead per square centimeter of paint [approximately 3 percent (by weight) of lead in a single coat] beneath ten layers of lead-free paint, has been tested in a preliminary survey of several tenement apartments in New York City.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)