| The MapPlace - Endako Geophysics (BCMEM
OF 2005-11
/
GSC OF 3534) |
 |
| Details:
Endako Geophysics
covers the
1997 Endako area survey and is available as
Geological Survey of Canada
Open File 3534 and
is available for
download from MIRAGE. This survey was
published to MapPlace on April 8, 2005. The MapPlace data includes digital
gridded images for 2 magnetic and 7 radiometric parameters for each survey
area. The downloadable files from this website are in georeferenced TIF –
tagged image and PNG formats (UTM NAD 83 and Albers projections) and GRD -
Geosoft gridded data format (UTM NAD 83 only). PDF theme files are also
available.
View
Endako Geophysics Map
Survey Summary:
ENDAKO GEOPHYSICAL SURVEY
BCMEM Open File
2005-11 /
GSC Open File 3534
Airborne geophysical survey,
Endako, British Columbia
(Parts of NTS 93F/15NW; 93K/02W; 93K/03E)
Geological Survey of Canada;
9 maps
Analogue and
digital products include data for seven radiometric and two magnetic
parameters:
| Map Layer
Themes |
Endako
PDF
Themes Files
see Note 1 |
| MTF - Magnetic total
field (nT) |
|
|
CVG -
Calculated magnetic vertical gradient (computed, nT/m) |
|
|
POT -
Potassium (K, %) |
|
|
URA -
equivalent Uranium (eU, ppm) |
|
|
THO - equivalent Thorium (eTh, ppm) |
|
|
ADRN -
Natural air absorbed dose rate (ADRN, nGy/h) |
|
|
RUT -
equivalent Uranium/equivalent Thorium (eU/eTh) |
|
|
RUK - equivalent Uranium/Potassium (eU/K, ppm/%) |
|
|
RTK - equivalent Thorium/Potassium (eTh/K, ppm/%) |
|
| 1:250K Scale Geology, Mineral Occurrences &
Titles |
|
| All Themes in one file (11 by 17 images) |
|
| File
Downloads |
Zip
Files |
| Georeferenced TIFF files (UTM Zone 10 NAD 83) |
E_tif_Z10.zip
(3.6MB) |
| Georeferenced TIFF files (Albers NAD 83) |
E_tif_AL.zip
(3.6MB) |
| Georeferenced PNG files (UTM Zone 10 NAD 83) |
E_png_Z10.zip
(1.8MB) |
| Georeferenced PNG files (Albers NAD 83) |
E_png_AL.zip
(1.9MB) |
| Original GSC SurView data files for viewing and
printing only (.gri & .grx) |
E_gri.zip
(10.9MB) |
| Original GSC Geosoft gridded data format (.grd),
see Note 2 |
E_grid.zip
(12.5MB) |
Note 1: The PDF maps were created from
MapPlace using the Rasterize print job option to
eliminate the black background. The TIF and PNG download images include
the geophysical information without topographic base
information.
|
Legend:
K - potassium, i.e. K40 (units: %)
eU - equivalent uranium concentration by weight (the spectrometer
directly measures Bi214, that is an indirect measure of uranium) (units:
ppm)
eTh - equivalent thorium concentration by weight (the
spectrometer directly measures Tl208, that is an indirect measure of
thorium) (units: ppm)
Total Count - all counts from 400 to 3000 keV. (units: cps or uR/h)
Natural Exposure - computed from K (%), eU (ppm), eTh (ppm)
concentrations:
Exposure = 1.505 K + 0.625 eU + 0.31 eTh (uR/h)
(Grasty et al, 1984) 'Exposure' is different from the traditional 'Total
Count', in that it excludes radiation from man-made contaminants.
Natural Air Absorbed Dose Rate - computed from K (%), eU (ppm),
eTh (ppm) concentrations:
Absorbed Dose Rate = 13.08 K + 5.43 eU + 2.69 eTh (nGy/h) 'Natural Air
Absorbed Dose Rate' is different from the traditional 'Total Count', in
that it excludes radiation from man-made contaminants.
eU/eTh, eU/K, eTh/K - ratios of K, eU, eTh that are useful for
interpretation
|
Units:
nT - unit of magnetic total field (nano Tesla)
ppm - unit of concentration by weight (part per million), used
for eU (uranium) and eTh (thorium)
% - for potassium (K40): unit of concentration by weight
Ur - unit of radioelement concentration by weight
(1 Ur is defined as the total count rate from 1 ppm uranium in
equilibrium)
µR/h - unit of Exposure (micro Roentgen/hour)
nGy/h - unit of Natural Air Absorbed Dose Rate (nano Gray/hour)
|
|
This page was last updated
September 12, 2007. |
