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Electrical Properties and Attenuation Distance of Upper Pennsylvanian Coal Measure Rock from Southwestern Pennsylvania.

Authors
Lindroth-DP; Wingquist-CF; Dehler-AL
Source
MISSING :27 pages
Link
NIOSHTIC No.
10003422
Abstract
The Bureau of Mines is engaged in research on ground probing radars for detection of geologic hazards in advance of mining. Penetration distances and interpretation models depend on the dielectric- properties and wave propagation characteristics for coal measure stratified media. Relative dielectric constants and dissipation factors were measured under ambient conditions for Pittsburgh seam coal measure rock over the frequency range of 20 to 100 mhz by the susceptance-variation method. The rock types measured were representative sedimentary rock located above the Pittsburgh coal seam. Extreme values for the computed attenuation distance ranged from 1.7 M at 100 mhz for siltstone to 230 m at 20 mhz for a particular limestone.
Publication Date
19840101
Document Type
IH; Report of Investigations
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
RI 8864
NIOSH Division
TCRC;
Source Name
MISSING
State
PA;
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