Some properties of the iodine pentafluoride-hydrogen fluoride system have been investigated. The solid-liquid phase diagram show a eutectic point at -83.49 degree C. and 99.5 mole% hydrogen fluoride. The vapor pressures at 15 degree C show positives deviations from Raoult's law but no maximum vapor pressure was observed. There is a small decrease in volume on mixing, the maximum deviation from ideality being 6.6% at 90 mole% hydrogen fluoride. The specific conductance of pure iodine pentafluoride at 25 degree C is 5.4 x 10-6 olm-1 cm-1. The specific and molar conductances of mixtures of iodine pentafluoride and hydrogen fluoride have been measured over the entire concentration range.

Uranium was plastically deformed 90% at room temperature by unidirectional rolling to a foil 0.002-inches thick. Specimens were recrystallized in the alpha region and several pole figures obtained from 0 to 40 degrees. From these, the preferred orientation was found to be in a spread of idealized (11) [010] about [010].

There is at present a large collection of data giving the relative abundances of ions formed when molecules, especially hydrocarbons, are bombard with electrons and collected as positives ions in a mass spectrometer. This data per se gives us little insight into the kinetic processes occurring until it is combined with thermodynamic data and subject to a theoretical treatment based upon an assumed model for the kinetic processes taking place in the mass spectrometer. In accordance with our desire to learn more about these kinetic processes and in this way to shed some light on problems of molecular structure we have continued to explore the possible kinetic paths which propane ions take during their decomposition, with special reference to the effect of the substitution of deuterium for hydrogen.

Two spectrophotometric methods are given for determining dissociation constants of dibasic acids. Each method is applicable for any degree of overlapping of the dissociation constants. Neither method requires a direct measurement of the extinction coefficient of any of the individual species that are in equilibrium with each other. A minimum amount of data is required in either method.

Knowledge of the mechanisms involved in the aqueous absorption of nitrogen oxides is limited, and no definite evidence has been available to indicate if the major chemical reactions involved occur in the gas phase or in the liquid phase. This work was undertaken to determine in which phases the chemical reactions occur and to obtain additional information on the over-all mechanism of the removal process. The results of this investigation show that the rate of absorption of nitrogen oxides decreases significantly as the operating temperature is increased. The major portion of the chemical reactions occurs in the liquid film and the gas film, with an appreciable amount of the reactions occurring in each.

Infrared spectra of solid NaXO2(Ac)3, with X=U, Np, Pu, and Am, have been observed. From the symmetric and asymmetric stretching frequencies of the O-X-O groups, approximate X-O force constants have been calculated and were found to decrease in the order kU—O>kNp—O>kPu—O> kAm—O, the respective values being about 0.705, 0.698, 0.675, and 0.612 megadyne/cm. From the cell constants for NaXO2(Ac)3 it is apparent that the X-O bond distance decreases in the same order—RU—O>RNp—O>RPu—O>RAm—O. Thus, a decrease in bond distance appears to be accompanied by a decrease in force constant, probably because the bond, though shortened by contraction of the electron shells of the metal, is weakened by interaction with the extra valence shell electrons.

The results of equation of state measurements made behind strong shock waves in nitrogen are consistent only with the higher of the two spectroscopically acceptable values of the dissociation energy of nitrogen, 9.764 ev.

This note reports two calculation that we believe help to clarify the nature of the approximation made in the method Brueckner, et al, for the ground state of many-Fermion systems. The first is a formal calculation of their result for the energy in terms of two-body forward scattering amplitudes from elementary perturbation theory. We find that their result is obtained when one keeps only those terms in the perturbation expansion that depend on pair correlations. From this point of view the method appears as an analogue of the virial expansion of the gas equation of state, stopping with the term in pair interactions.

Calorimetric combustions of calcium metal were conducted at an initial temperate of 25 degree under an oxygen pressure of 50 atm. The energy of combustion under these conditions was to be 15,649 joules/g. The corresponding standard heat of formation of the oxide from the elements is calculated to be -628.63 +- 0.99 kjourles/mole. this value if 1.1% more positive than the previous accepted value.

The adsorption on activated charcoal of pure He3 at 2.5 and 3°K, and of pure He4 at 4°K has been measured. The volume of gas necessary to form a monolayer is approximately the same for the two isotopes. It is shown that capillary condensation does not occur in this adsorbent at low saturations. The data have been analyzed by a number of methods with consistent results.

This method essentially consists of analyzing x-ray filtration data in terms of Laplace transforms and obtaining the spectral energy distribution in terms of a sum of the corresponding inverse Laplace transforms. Some of the functions which are especially suited for this application are given and a graphical method of analyzing filtration data in terms of these functions is described. Examples of the practical application of this method to several low energy x-ray machines are included with a discussion of the advantages, disadvantages, and probable uncertainties which are involved.

The design and construction of a 1,000,000 fps rotating mirror frame camera is described. Twenty five consecutive pictures 20 mm in diameter can be obtained on a strip of 35 mm film. A resolution of at least 20 lines/mm is obtained on a moderately fast film like Linagraph Shellburst. Accurate synchronization of the event to be photographed is required. The camera has been most useful in the investigation of explosive and related phenomena.

Gamma plutonium is found to be orthorhombic with eight atoms in a unit cell of dimension (1t 235 degree C) [formula]. The calculated density is [formula]. The space group is Fddd and the positions of the eight atoms are: [formula]. Each plutonium atom is bonded to ten others at an aver distance of [formula], four being at [formula], two at [formula] and found at [formula]. The mean linear coefficients of thermal expansion are found to be [formula].

Extensive numerical evaluation was performed on a Fourier series derived for the potential distribution in an electrolyte lying above a plane containing infinitely long, narrow electrodes juxtaposed and arranged in an infinitely alternating array with even symmetry. In contrast to the previous studies in this series, the limitation that the electrolyte has finite depth was imposed. Four perspective drawings of the reduced potential function were made to scale to illustrate the potential variation throughout the solution. From this study a practical rule was established for deciding from the behavior of the electrochemical system what effectively is an "infinite thickness" of the electrolyte. Current density variation over the anode was evaluated for several different combinations of relative thickness b/c and of relative polarization parameter ~/c. When b/c is small, the major part of the corrosion current is concentrated in the vicinity of the anode-cathode junction, provided that the electrical resistance of corrodent is not too high or the polarization too strong, i.e., provided that ~ is relatively small in comparison with c. Several graphs of C* (x) were included to illustrate the effects of the dimensionless groups (a/e), (b/c), and (~/c). Comparison with published experimental data was made, and the agreement …

Data which determine points on the Hugoniot curves of fourteen solids are given in the technical report.

Progress is reported in studies on (1) injection tables, (2) radon escape from bone containing radium, (3) on the question of th228 translocation in Ra228 dogs, (4) further studies on the metabolism of Th228 and its daughters, (5) veterinary group report, (6) hematology observations, (7) biochemistry, (8) pathology and detailed radioautography report, (9) radioautographic studies of Pu and RdTh teeth, (10) effect of parathormone on the deposition of Pu in rats, (11) speculation on the toxicity of RdTh and MeTh relative to radium, (12) autoradiographic and histopathologic studies of beagle puppies administered intravenously with Sr90, (13) plasma Fe study, and (14) Cr51 tagging RBC study.

There was considerable disagreement between results obtained by early investigators who studied the interaction of ionizing radiations with solid nitrates. It was thought worthwhile, therefore, to extend their work and to make certain that reproducible results were being obtained. It was expected that the nitrite ion and oxygen would be found in equivalent amounts in the irradiated samples. Four measurements of nitrite ion and oxygen indicate that the decomposition of barium nitrate by gamma rays probably proceeds by more than one path.

The role of endogenous infections was investigated as a contributory cause of death in mice irradiated with doses of 400 to 800 r x radiation and 480 to 616 rem of thermal column radiation. Results indicate a direct relationship between mortality and bacteremia following exposure to both types of radiation.

A generalization of the Fermi-Thomas model for application of mixtures. This study attempts to determine the equation of state of water up to pressure of 10,000 megabars and temperatures of several thousand electron-volts.

A pulsed 931-A photomultiplier and TW-10 traveling wave oscilloscope have been used to measure the scintillation decay times of (a) transtilbene, (b) terphenyl-in-toluene, and (c) polystyrene plastic containing one percent terphenyl, 0.03% α-NPO, and 0.01% zinc stearate. The times for 1/e decay are (a) 4±1×10-9 sec, (b) 2.2±0.3×10-9 sec, and (c) 2.2±0.3×10-9 sec. The behavior of the multiplier with large collector currents was studied, using a synchronized flash lamp. Linear currents up to 1.5 amperes and maximum currents up to 15 amperes were obtained. Currents in the ampere range can give rise to an oscillation which may limit the application of pulsed photomultipliers.

A comparison of the simple impact theories of line broadening by electrons with the detailed computations of Kivel, Bloom, and Margenau.

During this period a prototype gamma ray detection system was assembled and data was obtained on samples of beryllium salts on filter paper under a variety of conditions. Ordinarily either a scaler-register combination or the CRM-recorder combination would be sufficient for obtaining data. Both units have been used here in order to utilize the particular advantages of each system. The scaler-register unit was employed for obtaining precise data over short intervals while the CRM-recorder was used to maintain a check on stability over longer intervals of time.

A method to determine the correction to Grüneisen's law corresponding to the effect of the electrons at high pressure. It is assumed that the lattice contribution to the pressure is small and that the equation of state of the solid can be approximated by results of the statistical Thomas-Fermi atom model for the electron pressure.

Equipment has been designed and constructed for the purpose of leaching pure uranium minerals in both acidic and basic circuits. This equipment provides a means for removal of a series of samples during any one run, control over speed of agitation, indication of gas over pressure, and automatic temperature control. These units may be operated up to 1500 p.s.i. Solid UO2 samples were prepared by sintering under hydrogen to 1800 degree C. Preliminary results of the leaching of sintered UO2 in a basic Na2CO3-NaHCO3 circuit resulted in the formation of an insoluble yellow precipitate (probably Na2UO4) for low concentrations of Na2-NaHCO3. At higher carbonate concentrations no insoluble precipitate was formed and the rate of leaching was found to increase vary rapidly above 300 p.s.i. oxygen over pressure.