From abstract: "A new type of scintillation spectrometer is described. It is designed to suppress signals arising from incident photons that are not completely absorbed in the primary detecting NaI(T1) crystal."

The following document describes the usage of Vinylite or plastic sheeting for operation and maintenance across a contamination barrier, presenting ecological advantages, photos of special equipment and techniques used during procedure, and the purpose of eliminating open air transfer in contaminated area.

The following document provides diagrams of wiring circuits and maps of potential curves of the indicator systems.

The following report provides information on the making of large sheets of boral, an engineering material for the absorption of thermal neutrons, as well as physical properties and recommendations on casting and rolling ingots into sheets.

Report discussing the possibility of Si^32 occurring in nature. Negative results of neutron activation experiments to detect the nuclide are included in the report.

From abstract: "This temperature data serves to suggest an ionic mechanism for electrical conduction in polyethylene as opposed to an electronic mechanism. In fact, the ion contributing most to the conduction in the polyethylene may well be the proton."

The corrosion of uranium in moist air is more rapid than had been thought previously. Earlier recommendations were based on test of 300 hr duration. In tests which were conducted for over 1000 hr, moisture has less effect than in those tests made over shorter periods. The corrosion of uranium by dry and moist air has been studied at 38, 57, and 75 degrees C. Although moisture increases the rate of initial attack, after 200 to 500 hr the effect is reduced and an accelerating corrosion rate overshadows the initial effects of moisture.

Abstract: " The construction and operation of a dropping mercury polaroscope developed by Quentin A. Kerns is described herein. With this polaroscope a Heyrovsky polarogram is automatically produced on the screen of a cathode ray tube during the formation of each drop at the tip of a dropping mercury electrode, a change in the resistance of the cell operates to initiate the generation of a voltage wave to be applied to the cell during the formation of the next drop during a predetermined fractional portion of the average drop formation period."

"The method described was developed for the determination of radium in residues containing silica, berium and lead sulfates, and other oxides and sulfates. The sample is heated in a platinum vessel with orthophosphoric and hydrofluoric acids on continued heating, silica, excess HF, and sulfate are eveolved and the resultant clear, viscous melt is completely soluble in water. Radium may be determined in an appropriate aliquot of this solution by the standard barium chlorids carrier precipitation procedure."

The purpose of this report is to investigate the effect of neutrons being captured before they are completely slowed down and have the chance to leak out and thus correspondingly increase the multiplication factor of the lattice.

The following report discusses methods developed through various investigations on the effect of hydrogen on the stability and stabilization of perfluoro oils toward fluorine, using compounds of carbon and fluorine or "perfluorocarbons" as the subject of study.

The following report documents progress the development of an electromagnetic flowmeter that measures the flow of half alloy, covering the period for March 1 to November 30, 1947.

From abstract: "Relocation of the ion source in the 86-inch cyclotron has increased the available beam energy substantially. Modifications have also been made to permit the use of targets of 100 square inches. Proton currents of one milliampere can now be obtained readily at ~24 Mev. The 63-inch cyclotron has been completely assembled and checked. In rf tests a 75 kv dee-to-dee voltage has been maintained, under vacuum, for long periods without evidences of failures, thus exceeding the 60 kv design specification. In an investigation of proton beam distribution on the 22-inch cyclotron it has been shown that almost all of the loss of protons form the beam occurs within one-half of the maximum radius. The ration of H3+ to H1+ ions in the beam increases at lower at lower arc intensities in the ion source. Accelerated corrosion was found in an Inconel tube containing #14 eutectic (ARE) after a six-hour bombardment with 20 Mev protons at 4,500 watts/cc. Installation of facilities for the preparation of plutonium isotopes is nearing completion; preliminary tests are being made."

Abstract: "The equilibrium quotients and the specific rate constants for the disproportionation of Pu(IV) have been measured as a function of hydrogen and plutonium ion concentrations in perchloric acid solutions of unit ionic strength at 25.00 +/- 0.02. Instead of obtaining the plutonium ion concentrations spectrophotometrically as has been done by previous workers, measurements of the mean oxidation number of the solutions were combined with electromotive force measurements of the Pu(III)-Pu(IV) 'couple and the total plutonium ion concentrations. From these data it is possible to calculate the concentrations of Pu(III), Pu(IV) and Pu(VI) present in the solutions at any time. The equilibrium quotient for the disproportionation reaction has been found to be directly dependent upon the fourth power of the hydrogen ion concentration, thus supporting the existence of the plutonyl ion, PuO2++, in these solutions. A weighted mean value of 0.0089 was found for the Pu(IV) disproportionation equilibrium quotient in perchloric acid solutions of unit ionic strength at 25. The rate of the forward (disproportionation) reaction has been found to exhibit an inverse third power hydrogen ion concentration dependence and the most probable rate determining step of this reaction is PuOH++++ + Pu(OH)2++ --> Pu+++ + PuO2+ + H2O + …

Introduction: "A study has been made of the available high assay criticality data for materials of 93.4% and 95.3% U-235, 1, 2, 3 and minimum critical volumes have been estimated for several conditions."

Abstract: "Comparisons between calorimetric and ionization chamber measurements of the power generated in graphite by absorption of energetic gamma rays have been carried out. The results serve as a calibration of the chamber. They also serve to test the consistency between the theoretical performance of this type of chamber and previously determined values for the factors which relate ionization in the chamber to energy absorption in the walls."

The production of cross-type control rods having a span of 4-7/8 in., and an arm thickness of 1/8 in., was studied. Extrusion techniques were developed for producing cross-type control rods from each of two alloys; one containing 75% silver-25% cadmium, and the other containing 67% silver-30% cadmium-3% copper. Fabrication of the extruded crosses into clad control rods for the Mark I naval reactor was attempted. A set of unclad control rods for the Zero Power Reactor was produced. The effect of copper, nickel, aluminum, palladium, and indium, singly and in various combinations, on the physical and mechanical properties of silver cadmium was studied. Data are given on the work hardening and annealing of binary silver-cadmium alloys, and on the precipitation hardening of certain complex silver cadmium alloys. A materials specification and suggested fabrication procedure were established for nickel-clad extruded silver-cadmium control rods.

This report follows a preliminary investigation of asymmetry of frequent mass distribution from proton induced fission that has been made as a function of energy in the range 11-18 mev.

This report analyzes the americium-242m isotope and redetermines its half-life to yield a value of 16.01 +/- 0.02 hours, measuring its decay.

Handbook developed for Atomic Energy Commission personnel to provide current information on air cleaning methods and criteria for judging their effectiveness. The information is limited to particulate removal and does not cover the fields of ventilation or the removal of gaseous contaminants. The technical report includes discussions of the behavior of aerosols in air cleaning, air cleaning equipment, the performance and evaluation of air cleaning equipment, and special problems involved in the cleaning of radioactive aerosols.

The following report describes a high speed framing camera that was developed at the Los Alamos Scientific Laboratory. It contains a rotating mirror and 170 framing lenses working at f/26 to produce frame pictures 1.2 x 1.4 centimeters in size.

This report discusses two methods of induction melting without refractory crucibles, the methods are drip melting and auto crucible melting.

Summary: "Data obtained from testing and observing samples of 63S Al irradiated for approximately three months are presented. Tensile data show a slight, general increase in strength during pile exposure with a slight decrease in elongation. It is uncertain whether tkis increase in strength is a result of irradiation, exposure to slightly elevated temperatures, or a combination of the two effects. Metallographic examination revealed no apparent damage to the microstructure. As a result of these tests. it was determined that there is no damage in the 63S Al samples caused by irradiation."

This report analyzes the frequency spectrum of the lattice vibrations in graphite in order to estimate the rate of loss of energy by slow neutrons.