Method and apparatus for measuring incombustible content of coal

Details Method and apparatus for measuring incombustible content of coal Method and apparatus for measuring incombustible content of coal

1975-02-14

1976-09-28

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

250273, G01N 2320, G21K 100

Patent

active

039833925

ABSTRACT:
Method and apparatus for measuring incombustible content of particulate material, particularly coal mine dust, includes placing a sample of the particulate material in a container to define a pair of angularly oriented surfaces of the sample, directing an incident gamma-ray beam from a radiation source at one surface of the sample and detecting gamma-ray backscatter from the other surface of the sample with a radiation detector having an output operating a display to indicate incombustible content of the sample. The positioning of the source and detector along different surfaces of the sample permits the depth of the scattering volume defined by intersection of the incident beam and a detection cone from the detector to be selected such that variations in scattered radiation produced by variations in density of the sample are compensated by variations in the attenuation of the incident beam and the gamma-ray backscatter.

REFERENCES:
patent: 3448264 (1969-06-01), Rhodes
patent: 3693079 (1972-09-01), Walker
patent: 3735126 (1973-05-01), Casper
patent: 3736426 (1973-05-01), Anderson et al.
patent: 3749910 (1973-07-01), Carr-Brion et al.
patent: 3840746 (1974-10-01), Kehler
patent: 3868509 (1975-02-01), Fasching et al.

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