초록 ▼

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 sou

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.

대표청구항 ▼

Apparatus for measuring the incombustible content of particulate material using a radiation backscatter technique comprising container means for holding a sample of the particulate material, said container means having first and second angularly oriented walls defining first and second angularly ori

Apparatus for measuring the incombustible content of particulate material using a radiation backscatter technique comprising container means for holding a sample of the particulate material, said container means having first and second angularly oriented walls defining first and second angularly oriented surfaces of the sample; first and second radiation source assembly means disposed on opposite sides of said container for producing low energy incident beams through said first wall of said container means at the first surface of the sample; and radiation detector means disposed adjacent said second wall of said container means for detecting backscattered radiation from the second surface of the sample whereby variations in scattered radiation caused by variations in density of the sample are compensated by variations in attenuation of said incident radiation beam and said backscattered radiation.