GSC Open File Release Notices

Archived information

The text below is an exact reproduction of the original release notice, which was often unilingual.  It contains information that is not readily available elsewhere.  The information on pricing and availability is out of date.

Release Notice Text


Gamma-ray spectrometer profiles, Ottawa, Ontario to Yellowknife, Northwest Territories. This item comprises data derived from work carried out in July and August 1969. The data are presently in computer-plotted form showing total, potassium, uranium and thorium count rates, and uranium/thorium ratios plotted against distance with fiducial and mileage marks. The item is made up of 39 profiles (scale approx. 1:1,000,000) an index map and the flight lines shown on ten 1:1,000,000 sheets. Data were obtained using six 9x4 inch Nal (Tl) detector crystals at a mean terrain clearance of 500 feet. The results are corrected for variations in terrain clearance, atmospheric background radiation and Compton scattering.

Now Published: as GSC Paper 70-46. Copies may be obtained at the GSC Publications Office, Ottawa.


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