Abstract: A suite of 50 rock specimens, collected by the 1947 Washburn Mount McKinley Expedition, was scanned radiometrically. The maximum radioactivity observed in any one of the specimens was about twice background. Radiometric analyses of the most radioactive samples show that a sample of vein quartz coated with manganese oxide contains 0.009 percent equivalent uranium and that the maximum equivalent uranium content of granitic rock types is .004 percent. The radioactivity of the manganese-stained quartz is probably due to traces of uranium in the manganese mineral, whereas that of the granitic rocks is due to radioactive accessory minerals.

From introduction: Since 1945 the Alaskan Trace Elements Unit of the U. S. Geological. Survey has been engaged in reconnaissance for radioactive deposits in Alaska, first on behalf of the Manhattan Engineer District, later on behalf of the Atomic Energy Commission. During the period January 1945 through December 1952, 42 reports in the Survey's Trace Elements Investigations series and 18 reports in the Trace Elements Memorandum series, a totaJ of 60 reports, have been completed or are in preparation Of these 60 reports 44 have been completed and transmitted to the Commission as of December 31, 1952.

Report discussing the uranium-containing radioactive granite of the Miller House-Circle Hot Springs area of east-central Alaska.

The following report provides results taken from more than 600 samples found in Alaska, mostly concentrates from placer operations, that were tested for radioactivity during January 1945 in the laboratory of the Geological Survey.

Report discussing a study in which a suite of 50 rock specimens collected by the 1947 Washburn Mount McKinley Expedition was scanned radiometrically.

Report discussing a 1949 geological examination for radioactive deposits in the Nixon Fork mining district of Medfra quadrangle, central Alaska.

Report discussing the investigation of radioactive deposits in granite and search for bedrock source of radioactive materials in the Ruby-Poorman district of Alaska during July 1949.

Report discussing an investigation of radioactivity occurrences, mostly caused by thorium in thorite and monazite, in various parts of southeastern Alaska. The geology and structural qualities of these radioactive areas are discussed.

Abstract: "The highest radioactivity value obtained in a traverse of shales in the Middle Paleozoic section of the lower Coleen River is 0.003 percent equivalent uranium. Traverses on pre-Cambrian schists at Rabbit Mountain were made with negative results."

A report regarding a reconnaissance for radioactive deposits in southeastern Alaska, 1952. Concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.

A report regarding radioactive granite located in the Miller House-Circle Hot Springs area, in East-Central Alaska. This report contains work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.

A report regarding a reconnaissance done in 1949 in order to look for radioactive deposits in the Nixon Fork Mining District, located in the Medfra Quadrangle, in Central Alaska.