The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1982
Filed:
Dec. 21, 1979
Lorin R Stieff, Kensington, MD (US);
Other;
Abstract
Locations of buried deposits are determined by detecting the presence of Pb214, Bi214, Po214, Pb210, Bi210 and Po210 in solutions obtained by chemically leaching these elements from rocks and soil. Polonium from the solution is plated on silver foil planchets. Alpha sensitive films are exposed to the alpha decay of Po214 and Po210 by contacting the films with the planchets. The films, when etched, reveal the damage caused by the passage of the high energy alpha particles. Alpha damage as a function of sample size, volume of solution used, planchet, foil or film area and exposure times measures concentration of Po214 and Po210 in the sample. Anomalus concentrations suggest presence of buried deposits containing uranium. Similar anomalus concentrations of alpha damage from Bi212 and Po212 formed in films exposed to foils or planchets plated from leached solutions containing Pb212, Bi212 and Po212 suggest deposits containing thorium. Plotting normalized alpha damage population (numbers of alpha per gram, per square mm., per hour) and sample locations suggest mineral deposit locations.