Differential surface composition analysis by multiple-voltage el

Details Differential surface composition analysis by multiple-voltage el Differential surface composition analysis by multiple-voltage el

1991-03-29

1993-05-11

Anderson, Bruce C.

Radiant energy

Inspection of solids or liquids by charged particles

Methods

250310, H01J 3726, G01N 23225

Patent

active

052104141

ABSTRACT:
A method of differential surface composition analysis which allows non-destructive compositional analysis with depths below a solid surface is used to analyze respirable dust particles to determine the presence of hazardous components in the surface of the dust particles. A method of incubating respirable particles in a surrogate pulmonary surfactant system used in combination with the differential surface composition analysis allows determination of surface components which survive or are exposed on the respiratory particles after incubation in the surrogate pulmonary surfactant, representing modification of the partical surface upon deposition in the lung.

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patent: 4962516 (1990-10-01), Soezima
Wallace, et al., "Clay Occlusion of Respirable Quartz Particles Detected by Low Voltage Scanning Electron Microscopy--X-Ray Analysis", Ann. Occup. Hyg., vol. 34, No. 2, pp. 195-204 (1990).

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