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Investigations of Salt River Vanadium Deposits, Lincoln County, Wyoming

Description: Report issued by the Bureau of Mines over studies conducted on the vanadium deposits of Lincoln County, Wyoming. As stated in the introduction, "the work performed by the Bureau of Mines is explained in detail and supplemented with plans, sections, and a complete set of sample analyses. Proposed mining methods are discussed, and metallurgical tests are outlined" (p. 2). This report includes tables, maps, and illustrations.
Date: August 1949
Creator: Allsman, Paul T.; Majors, Forest H.; Mahoney, Stanford R. & Young, W. A.
Partner: UNT Libraries Government Documents Department
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Lead-Zinc-Silver in the Poughkeepsie District and Part of the Upper Uncompahgre and Mineral Point Districts, Ouray and San Juan Counties, Colorado

Description: Report issued by the Bureau of Mines over mining districts in Colorado. As noted in the introduction, "in this report the physical features, climate, and ore deposits of the districts are described, and a brief history of mining and production of lead, zinc, and silver is given" (p. 4). This report includes tables, illustrations, and maps.
Date: September 1949
Creator: Hazen, Scott W., Jr.
Partner: UNT Libraries Government Documents Department
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Investigation of Casper Mountain Chromite Deposits, Natrona County, Wyoming

Description: Report issued by the Bureau of Mines over a large chromite deposit on Casper Mountain. Description of the deposit is listed. This report includes tables, maps, and illustrations.
Date: August 1949
Creator: Horton, Frederick W. & Allsman, Paul T.
Partner: UNT Libraries Government Documents Department
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Titanium Minerals in Central and Northeastern Florida

Description: Report issued by the Bureau of Mines over titanium minerals in Florida. Evaluation of titanium samples obtained is presented. This report includes tables, and maps.
Date: September 1949
Creator: Thoenen, J. R. & Warne, J. D.
Partner: UNT Libraries Government Documents Department
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Investigation of the Young American Lead-Zinc Deposit, Stevens County, Washington

Description: Report issued by the Bureau of Mines over investigations of mines in Stevens County, Washington. The history, geology, and physical features of the mines are presented. This report includes tables, maps, and illustrations.
Date: November 1949
Creator: Hundhausen, Robert J.
Partner: UNT Libraries Government Documents Department
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National Motor-Gasoline Survey: Winter 1948-49

Description: Report issued by the Bureau of Mines over surveys conducted on the motor fuels sold during the winter of 1948-1949. The properties of the fuels sampled are presented. This report includes tables, graphs, and maps.
Date: July 1949
Creator: Blade, O. C.
Partner: UNT Libraries Government Documents Department
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Investigation of the McCormick Chromite Mine, Tuolumne County, California

Description: Report issued by the Bureau of Mines over investigations on the McCormick chromite mine. Descriptions of the chromite deposits are presented. Details about the development made in the mine are listed. This report includes tables, maps, and illustrations.
Date: November 1949
Creator: Shattuck, John R. & Ricker, Spangler
Partner: UNT Libraries Government Documents Department
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Diamond Drilling at the Boston Consolidated Copper Mine, Salt Lake County, Utah

Description: Report issued by the Bureau of Mines over diamond-drilling projects in Salt Lake County. The geology, physical features, and history of the mines are presented. This report includes tables, maps, illustrations, and photographs.
Date: November 1949
Creator: Jones, Robert L. & Wilson, Stephen R.
Partner: UNT Libraries Government Documents Department
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Investigation of Christy Titanium Deposit, Hot Spring County, Arkansas

Description: Report issued by the Bureau of Mines over titanium deposits on the Christy property in Arkansas. Details of the location, and drilling methods are presented. This report includes tables, maps, illustrations, and photographs.
Date: December 1949
Creator: Reed, Donald F.
Partner: UNT Libraries Government Documents Department
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Investigation of Magnet Cove Rutile Deposit, Hot Spring County, Arkansas

Description: Report issued by the Bureau of Mines on the exploration of the Magnet Cove Rutile deposits. Descriptions of the deposit, and characteristics of the pyrite, titanium, and mineral ore are presented. This report includes tables, maps, and illustrations.
Date: December 1949
Creator: Reed, Donald F.
Partner: UNT Libraries Government Documents Department
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United States Earthquakes, 1949

Description: Report discussing earthquake activity in the United States during 1949. The report is broken down by regions and has sections for specific earthquakes.
Date: 1949
Partner: UNT Libraries Government Documents Department
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Tables of the Confluent Hypergeometric Function F(n/2, 1/2; X) and Related Functions

Description: Report presenting tables of the confluent hypergeometric function and some related functions. Information regarding the scope of tables, analytical properties, and approximations are provided.
Date: 1949
Creator: United States. National Bureau of Standards. Computation Laboratory.
Partner: UNT Libraries Government Documents Department
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Iron Blast-Furnace Slag Production Processing, Properties, and Uses

Description: Report issued by the Bureau of Mines over the production of blast-furnace slag. Characteristics and uses of slag are discussed. This report includes tables, maps, illustrations, and photographs.
Date: 1949
Creator: Josephson, G. W.; Sillers, F., Jr. & Runner, D. G.
Partner: UNT Libraries Government Documents Department
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Nitrogen 12

Description: N{sup 12} is shown to have a half life of 12.5 {+-} 1 milliseconds, and a positron upper limit of 16.6 {+-} 0.2 Mev. It is produced by the reaction C{sup 12}(p,n)N{sup 12}, and has a threshold proton energy of 20.0 Mev. This indicates that N{sup 12} is within about 200 Kev of being unstable against proton emission. The mass of N{sup 12} is 12.0228 {+-} 0.00015, and the beta transition is allowed.
Date: January 19, 1949
Creator: Alvarez, Luis W.
Partner: UNT Libraries Government Documents Department
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Experiments on the Effect of Atomic Electrons on the DecayConstant of Be7 II.

Description: A comparison of the decay constants of Be{sup 7} in beryllium oxide and in beryllium fluoride has given {lambda}{sub BeO}-{lambda}{sub BeF{sub 2}} = (+1.375 {+-} 0.053)10{sup -3}{lambda}{sub BeO} thus showing a definite effect of the chemical binding on the radioactive decay constant.
Date: June 15, 1949
Creator: Leininger, R. F.; Segre, E. & Wiegand, C.
Partner: UNT Libraries Government Documents Department
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Low Mass Francium and Emanation Isotopes of High AlphaStability

Description: Isotopes of francium with 126 or fewer neutrons have been looked for in bombardments of Th{sup 232} with 350 Mev protons from the 184-inch cyclotron. Fr{sup 212} with an apparent half-life of 19.3 minutes for branching decay by alpha emission (44%) to At{sup 208} and by orbital electron capture (56%) to Em{sup 212} has been found. Em{sup 212} is shown to be a 23-minute alpha-emitter. At{sup 208} decays primarily (99.5%) by orbital electron capture to Po{sup 208}, but shows 0.5% alpha-branching.… more
Date: October 10, 1949
Creator: Hyde, E. K.; Ghiorso, A. & Seaborg, G. T.
Partner: UNT Libraries Government Documents Department
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New Low Mass Isotopes of Emanation (Element 86)

Description: Among the spallation products obtained from the 350-Mev proton bombardment of Th{sup 232} they have identified two gaseous alpha-emitters which apparently do not decay into any presently known alpha-decay chains. The half-lives observed for the decay of the alpha-activities are 23 minutes and 2.1 hours. These half-lives may be principally determined by an unknown amount of orbital electron capture. At least one alpha-emitting daughter (about 4 hours half-life) has been observed to grow from a g… more
Date: September 5, 1949
Creator: Ghiorso, A.; Meinke, W. W. & Seaborg, G. T.
Partner: UNT Libraries Government Documents Department
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Systematics of Alpha-Radioactivity

Description: Correlations of alpha-decay energies in terms of mass number and atomic number have been made for all of the alpha-emitting species now numbering over 100. For each element isotopes show increase in alpha-energy with decrease in mass number except in the region of 126 neutrons where there is an explainable reversal. This reversal has the effect of creating a region of relatively low alpha-energy and long half-life at low mass numbers for such elements as astatine, emanation, francium, and possi… more
Date: September 12, 1949
Creator: Perlman, I.; Ghiorso, A. & Seaborg, G. T.
Partner: UNT Libraries Government Documents Department
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A Proposed Experimental Test of the Neutrino Theory

Description: The experiment outlined in this proposal has the possibility of giving an answer to the important question, 'Does the neutrino exist'? It is unfortunate that at the present time, there is no convincing experimental that neutrinos exist. Two recent articles review the status of various experiments which could give information about neutrinos. In general, these experiments give results in agreement with the predictions of beta decay theory. But actually, if even the most complete of the 'recoil t… more
Date: April 18, 1949
Creator: Alvarez, Luis W.
Partner: UNT Libraries Government Documents Department
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Carrier-free Radioisotopes from Cyclotron Targets I. Preparation and Isolation of Sn113 and In114 from Cadmium

Description: The cyclotron is the only practical source of many carrier-free radioisotopes. The preparation and radiochemical isolation of a number of these activities, produced in the 60-inch cyclotron of Crocker Laboratory, will be presented in this paper and in subsequent papers of this series. In most cases the carrier-free radioisotopes were prepared for use in biological systems and the final preparations were in the form of isotonic saline solutions at a range of pH from 5 to 8. The present paper rep… more
Date: August 11, 1949
Creator: Maxwell, R. D.; Haymond, H. R.; Bobmberger, D. R.; Garrison, W. M. & Hamilton, J. G.
Partner: UNT Libraries Government Documents Department
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Half-Life for Double Beta-Decay

Description: Fireman(1) has reported the results of a rather difficult beta-particle coincidence counting experiment in which the decay of Sn{sup 124} by the simultaneous emission of two negative beta-particles, with a half-life between 0.4 x 10{sup 16} years and 0.9 x 10{sup 16} years, seems to have been observed. This note reports the results obtained from a different and somewhat simpler method of looking for the phenomenon of simultaneous emission of two beta-particles. These results are negative so far… more
Date: October 21, 1949
Creator: Levine, C. A.; Ghiorso, A. & Seaborg, G. T.
Partner: UNT Libraries Government Documents Department
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Alpha-Decay in Isotopes of Atomic Number Less Than 83

Description: Some time ago we started work in an attempt to observe alpha-particle decay in isotopes of atomic number less than 83. In the first experiments, thin targets of gold leaf were bombarded with 190-Mev deuterons in the 184-inch cyclotron. Two alpha-decay periods were observed in these targets; one of 0.7 minutes half-life and another of 4.3 minutes half-life. The alpha-particle energies were 5.7 and 5.2 Mev, respectively. Chemical separations proved that the 4.3-minute period is due to a gold isot… more
Date: September 5, 1949
Creator: Thompson, S. G.; Ghiorso, A.; Radmussen, J. O. & Seaborg, G. T.
Partner: UNT Libraries Government Documents Department
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