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Coal Mine Dust Incombustibles Content Analyzer Using a Gamma-ray Backscatter Technique.

Authors
Armstrong-FE
Source
NTIS: PB 234 696 :10 pages
Link
NIOSHTIC No.
10009292
Abstract
An instrument using a gamma-ray backscatter technique for determining the weight-percent incombustibles content of coal dust and rock dust mixtures in coal mines has been built and tested. The unit gives a direct readout in percent incombustibles for coal mine dust mixtures containing between 50 and 100 percent incombustibles. Calibration of the device requires using a sample of the rock dust employed; the sample is usually limestone but is occasionally dolomite or gypsum. A small americium-241 source is used with a scintillation detector, the output of which feeds a rate meter. The source-detector geometry used was chosen to reduce the effects of variation in bulk density. Accuracy of the system is within +/-3 percent for most mixtures. The instrument is portable and completely self-contained; the rechargeable batteries supply power for 300 to 400 determinations.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-234696
NTIS Price
A02
Identifying No.
RI 7946
Source Name
NTIS: PB 234 696
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