TY  - JOUR
T1  - X-ray diffraction analysis as applied in pneumoconiosis
AU  - SWEANY HC, KLAAS R
Y1  - 1939/02/18
N1  - 10.1001/jama.1939.02800070026006
JO  - Journal of the American Medical Association
SP  - 610
EP  - 614
VL  - 112
IS  - 7
N2  - When attention became centered on silicon dioxide as the cause of fibrosis in silicosis, it was expected that a chemical analysis for the substance would establish the presence or absence of pathologic levels in tissues and body fluids. Work in this direction was carried out by King and his associates,1 Fowweather,2 Riddell,3 Boehme4 and McNally.5 As with many similar situations in science, the results obtained by these workers did not measure up to expectations, for a positive correlation between the quantity of silica and the extent of pathologic changes was found not to exist in many instances. A chemical analysis gives only total silica, which may occur in the tissue as free silica or in the combined form of some silicate. If silicates are present to any great extent, a high value for silica will be obtained. If at the same time the amount of
SN  - 0002-9955
M3  - doi: 10.1001/jama.1939.02800070026006
UR  - http://dx.doi.org/10.1001/jama.1939.02800070026006
ER  -