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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
Electronics progress report, March 1--31, 1949

Electronics progress report, March 1--31, 1949

Date: December 31, 1949
Creator: Heyd, J.W. & Ohmart, P.E.
Description: With the completion of tests of the prototype cathode-follower, it was decided to produce three more models. These have been constructed and pass the same pulse as that of the prototype. Drawings are being made of these units. By the time these units had been completed, the amplifier of the scaler was modified so that its frequency response was essentially flat up to 4.5 megacycles. Using this amplifier and the cathode-follower, a study of the pulse shapes was made and four different pulse shapes were found to be obtainable. A band pass network between the B-wall tube and the input of the cathode-follower provided a very substantial improvement over the shunt peaking network with a band pass of 1.8 to 6.5 megacycles and provided clean, uniform pulses. Plans are being made to experiment with a filter of narrower band pass, which, if satisfactory, will produce greater amplitude. When the final band pass has been determined, a combination of shunt peaking and band pass networks should provide a net gain of 30% in amplitude. The result of this research is to provide an immediate improvement in resolution loss and a possibility of realizing a still lower minimum resolving time when the ...
Contributing Partner: UNT Libraries Government Documents Department
Neutron source progress report

Neutron source progress report

Date: December 1, 1948
Creator: Richmond, J.L.
Description: In this report progress is reported on the production of the postum-beryllium neutron sources and the postum-fluoborate neutron sources. A brief discussion is given for each. Results are given of the efficiency of the postum-fluoborate source and its comparison with Std. 9 and Al-1. This source was shipped to Los Alamos on December 16, 1948.
Contributing Partner: UNT Libraries Government Documents Department
Laboratory instrument design progress report, November 1--30, 1948

Laboratory instrument design progress report, November 1--30, 1948

Date: December 31, 1948
Creator: Olt, R.G.
Description: Progress is reported on the following projects: Quartz-fiber microbalance research, quartz-fiber construction and maintenance, design of multiple stirrer plating unit, and design of rotating stage for foil photography.
Contributing Partner: UNT Libraries Government Documents Department
The excretion of hexavalent uranium following intravenous administration. II, Studies on human subjects

The excretion of hexavalent uranium following intravenous administration. II, Studies on human subjects

Date: June 25, 1948
Creator: Bassett, S.H.; Frankel, A.; Cedars, N.; VanAlstine, H.; Waterhouse, C. & Cusson, K.
Description: Tracer studies employing uranium enriched in the isotopes U{sup 234}, U{sup 235} have been carried out in six human subjects; four males and two females. The uranium, 6 micrograms to 70 micrograms per kilogram of body weight was given intravenously in the hexavalent state as uranyl nitrate. Each individual of the series received a single injection of the metal except for one who was given two widely spaced doses. The first of these was when his condition was normal and the second after an acidosis had been produced by ingestion of ammonium chloride. Renal function tests including urinary catalase, protein, amino N to Creatinine N ratio and clearances of mannitol and p-aminohippurate were done before and after administration of uranium. Only at the 70 microgram per kilogram level in Subject 6 was there a slight rise in urinary catalase and protein suggesting that tolerance had been reached. The excretion of uranium was mainly in the urine, where from 70 to 85% of the administered dose appeared in the first twenty-four hours. Urine of the second twenty-four hours contained about 4% and the third twenty-four hour urine, 1.5% of the administered dose. Detectable amounts were excreted for at least two weeks.
Contributing Partner: UNT Libraries Government Documents Department
Gamma scale chemistry progress report, November 1--30, 1948

Gamma scale chemistry progress report, November 1--30, 1948

Date: December 31, 1948
Creator: Martin, A.W.
Description: This report details gamma scale chemistry activities at Mound Laboratory during the month of December 1948.
Contributing Partner: UNT Libraries Government Documents Department
Physics progress report

Physics progress report

Date: December 1, 1948
Creator: Haring, M.M.
Description: This document is the December 1948 Physics Division Progress Report from the Mound Laboratory. Items covered include: (1) measurement of the vapor pressure of polonium, (2) x-ray diffraction analysis of tantalum, (3) use of the vacuum balance, and (4) updates on efforts to prepare an x-ray target, measurement of the resistivity of polonium, and construction of polonium gamma standards.
Contributing Partner: UNT Libraries Government Documents Department
Determination of plutonium in human urine

Determination of plutonium in human urine

Date: August 14, 1947
Creator: Langham, W.H.
Description: Report is made of chemical procedures for determination of plutonium in human urine. The procedures are provided in outline form and statistical methods are provided for interpretation of the results.
Contributing Partner: UNT Libraries Government Documents Department
Density of metallic polonium (Information Meeting Paper No. 13)

Density of metallic polonium (Information Meeting Paper No. 13)

Date: November 9, 1948
Creator: Haring, M.M.
Description: This document is the report from a November 1948 meeting at Mound Laboratory on the measurement of the density of metallic polonium. Four determinations of the density of Polonium at 25 degrees C have been made. These values are 8.69 gm/cc, 9,34 gm/cc (twice) and 9.20 gm/cc. The probable error was 2%. The material used in the first determination was not subjected to a preliminary purification, which makes the value obtained doubtful. In this instance, production foils were used without a separation from their more volatile constituents. The difference in the reported value from that which appears in the Ad Interim Report is due to a recalculation based on the latest information on the physical constants of polonium. The value of using pure material and knowing the physical properties of polonium are clearly indicated.
Contributing Partner: UNT Libraries Government Documents Department
Neutron source progress report, March 1--31, 1948

Neutron source progress report, March 1--31, 1948

Date: December 31, 1948
Creator: Richmond, J.
Description: This monthly progress report describes efforts to prepare neutron sources with postum (Polonium 210) and either beryllium, boron or lithium by volatilization and by electrochemical deposition.
Contributing Partner: UNT Libraries Government Documents Department
Gamma scale chemistry progress report, July 1--31, 1948

Gamma scale chemistry progress report, July 1--31, 1948

Date: December 31, 1948
Creator: Martin, A.W.
Description: Preparation and analytical chemistry of postum (Polonium 210) dibromide and tetrabromide by bromination of metallic postum are described.
Contributing Partner: UNT Libraries Government Documents Department