A simple method of solving for the phase shifts of the pion-proton scattering is presented. The rapid solution afforded can be utilized, as the Ashkin diagrams have been employed, to give starting values to an electronic computer or alternatively to analyze with more ease the variation of the phase shifts as a function of the input data in terms of the coefficients of the angular distributions. A new plot of a function of the total cross section versus the pion energy is introduced. The nearly straight line resulting should help to evaluate the experimental data.

Information concerning the transformation kinetics of the gamma solid solution of uranium-base alloys is important. Accordingly, the metastability of the gamma phase was investigated for nine uranium-rich alloys of the U-Mo-Pt, U-Mo-Nb, and U-Nb systems. Samples were encapsulated in Vycor bulbs, solutions treated at 1000 decrees or 1050 degrees C, quenched to and annealed at temperatures between 600 degrees and 300 degrees C. Techniques employed to follow transformation included metallography, resistivity, X-ray diffraction and hardness. A difference exists between the TTT curves for the same alloy determined by different techniques. However, this is readily explained. The body-centered cubic gamma phase of the U-Mo and U-Mo-X alloys decomposes eutectoidally to form alpha and epsilon, an ordered structure. The eutectoid temperate is about 575 degrees C in the binary system. In the U-Nb system the gamma solid solution decomposes monometrically (or eutectoidally) to a product of alpha and another niobium-rich gamma phase. Alpha uranium has characteristic low solubility for either of the alloy components. The nose of the TTT curves for the U-5.1 wt % Mo and U-10 wt % Nb compositions exists at about 550 degrees C and 0.1 hour. Minimum times for transformation are longer for the other alloys. Rather …

A membrane demineralizer has been tested in a pressurized loop. The loop water resistivity was maintained in the 1-2 megohm range by ionized solid transfer in the demineralizer. The size and power requirement of the unit tested per gpm flow through the unit, were 2.3 cu ft and 100 watts. In view of the fact that present designed could reduce the size and required maintenance, further studies may be warranted.

A sweeping-image camera design of flexible application and easy construction is described. It is equally useful for bread-board, optical bench, or completely engineered construction. The heart of this camera is the optical train which consists of a collimator lens that renders the light from the image points into parallel beams, a rotating mirror to sweep these beams in an arc, and a box camera set at infinity focus to receive the reflected beams. The sweeping light beams form images which move across the film plane while at the same time remaining in sharp focus. The collimator lens may have either the subject being studied as an object or its image whose extent can conveniently be limited by a slit.

Progress report includes reports on (1) The isolation of pyrimidine deoxynucleotides from the acid-soluble fraction of thymus; (2) Non-specific protective effect of small lead shields against the lethal effects of whole body irradiation in the rat; (3) Strain differences in response to whole body irradiation and shielding procedures in the rat; (4) Renal clearance procedures in an evaluation of the effects of X-irradiation on renal function in a rat. A preliminary report; (5) The plasma erythropoietic stimulating factor. Observations on circulation erythrocytes and bone marrow of rats receiving protein-free extracts of rabbit plasma; (6)Additional observations on the plasma erythropoietic stimulating factor; (7) Studies on Trichinella Spiralia, VI-IX. (8) Effect of gamma radiation on infectivity of ascaris eggs. (9) Preliminary report of studies on taeniasis. (10) Studies on the role of labile humoral factors in irradiation injury. (11) Services of the Radiation Physics Unit. (12) Biological and physical effects of low energy monochromatic X-rays.

Although the results reported herein are rather encouraging and show the possibilities of utilizing flotation to increase recoveries and in some instances grades, they should not not be considered an optimum. As stated previously, time did not permit a detailed investigation of all reagents an conditions to obtain maximum grades and recoveries, but sufficient data, with enough typical samples, have been obtained to indicate a definite trend and encouragement for further studies. A comparison of the flotation results obtained with each of the samples is presented in Table 2.

The problem of a blast wave propagating through an inhomogeneous atmosphere is set up for computation by the CRC LORA. Previous treatments of this problem have used various simplifying assumptions such as that of purely radial flow. Since, however, pressure gradients in this situation will not in general be in the direction of rays from the blast center, non-radial flow will exist, and there is reason to believe that for large distances this effect will play a prominent role. Therefore, a program was set up for the numerical calculation (on the CRCLORA) of the propagation of a blast wave from a ground burse with altitude effects and possible tangential flow taken into account. With initial conditions known, the program is designed to give the pressure, density, radial and tangential flow velocities after successive time intervals at 16 equally spaced positions on each of 16 straight rays emanating from the point of burst. These positions are shifted with time to keep up with the shock front. Rehmeyer's and Van Neumann's method is used to handle the discontinuous shock front. In this method an artificial viscosity term is introduced in the the equations of motion in order to smooth out the discontinuity, …

A digital computer program for calculating least-squares solutions and making analyses of variance of sets of overdetermined linear equations is described. The entire code is reproduced with sufficient description of the program to enable anyone familiar with the Electrodata Datatron Computer to use it for similar problems.

A simple mechanical calculator has been developed for solving the transmission line equations when the characteristic impedance is a variable. The speed of computation is some two orders of magnitude faster than analytical methods. The theoretical basis is described and also the way in which it can be used. Some representative problems, which have benefited by us of the calculator, are discussed.

A principle for bending crystals with a minimum of strain so that they will focus x-rays and gamma-rays accurately to a point is explained. Detailed calculations are made of the aberrations in the foci resulting from various applications of the principle. the application of the principle in making a point focusing monochromator for low angle x-ray diffraction studies is discussed, and theoretical and experimental determinations of the reflection coefficient of the crystal are compared. A few experiments in low angle diffraction from biological materials using the new monochromator are described, and the results are compared with those obtained using other instruments.

The status of research is reviewed in a study of pulmonary granulomatosis in beryllium workers. Equipment for use in dust exposure studies is described. Preliminary results are reported from studies on the tissue distribution and pathological effects of beryllium dust in rats; the physical chemistry of solutions of beryllium salts; the effects of beryllium on enzyme systems, and the effects of ascorbic acid on beryllium excretion.

Ilford D1 and Eastman NTC nuclear emulsions have been loaded with a solution of uranium acetate and them exposed to the X-ray beam of the Case betatron operated at 18 Mev. The developed plates have been searched wit a Zeiss type microscope. A total number of 1062 fission tracks have been measured and analyzed and the angular distribution of the fission fragments in center of mas system has been obtained.

Most of the publications in the open literature available to us agree that sodium does not readily react with graphite, though potassium, rubidium, and cesium readily enter between the planes of the graphite lattice. In view of the conflicting evidence available, it seems inadvisable without very extensive further study to consider the use of graphite in direct contact with liquid sodium, except under very mild conditions of temperature and irradiation, and then only with very pure sodium and completely graphitized graphite.

An attempt to apply quantitatively the equation of state of a free electron gas to relatively low temperatures in order to emphasize correlation effects.

Data on the crystal structures of the common modifications of the elements at zero pressure.

Experimental results are presented of electron scattering by Ca, V, Co, In, Sb, Hf, Ta, W, Au, Bi, Th, and U, at 183 Mev and (for some of the elements) at 153 Mev. For those nuclei for which asphericity and inelastic scattering are absent or unimportant, i.e., Ca, V, Co, In, Sb, Au, and Bi, a partial wave analysis of the Dirac equation has been performed in which the nuclei are represented by static, spherically symmetric charge distributions. Smoothed uniform charge distributions have been assumed; these are characterized by a constant charge density in the central region of the nucleus, with a smoothed-out surface. Essentially two parameters can be determined, related to the radius and to the surface thickness. An examination of the Au experiments shows that the functional forms of the surface are not important, and that the charge density in the central regions is probably fairly flat, although it cannot be determined very accurately. An analysis of the experiments on the nuclei Ca, V, Co, In, Sb, Au, and Bi, assuming for convenience the Fermi smoothed uniform shape (1), then leads to the following results: the radial parameter c (the distance to the midpoint of the surface) scales …

Sixty-nine cases of suspected brain lesions were studied with both routine isotope encephalometry and the graphic method of analysis. Of thirty-two space occupying lesions, 68.7% were correctly diagnosed by both means, while 18.8% were negative with the routine method but were positive with the graphic method. The overall accuracy of locating a tumor when present was 87.5%. The proposed design for a scanning scintillation coincidence isotope-encephalometer is discussed.

A circuit had been constructed which supplied timing pulses for the various operating components of the UCLA F.M. cyclotron as well as counter gating pulses of variable widths and adjustable positions on the cyclotron duty cycle. The pulses are timed relative to a master pulse generated when the cyclotron oscillator passes through a specified frequency in the direction of decreasing frequency, thus giving only one master pulse per duty cycle. Overall stability of the timing circuit is about one mu sec.

Irradiation of a living animal with X-rays induces alternation in the proteins of cells in which ionization events occur. Systematic end-products such as the proteins of plasma would, by changes in quality and quantity divulge modification of their synthetic pathways, or compensatory responses of the hematopoietic systems to stresses caused by irradiation in other organs. Serological identification of proteins, a sensitive means of biochemical characterizations was chosen to reveal variations in the proteins of the plasmas of chickens that had been exposed to large, but sub-lethal, doses of X-ray irradiation. Turbidimetric comparisons were made of precipitation tests involving reactions between antisera produced in rabbits against the sera of normal chickens, and pre-irradiation and post-irradiation samples of plasma from 15 chickens.

Rats were exposed, by inhalation and intratracheal insufflation, to soluble and insoluble particles of uniform size but varying specific activity. The same number of particles was administered in each case, thus making the doses proportional to the specific activity per particle. The insoluble particles consisted of barium sulfate , while the soluble particles were sodium sulfate. Neither of these compounds is chemically toxic in the quantities used in these experiments. The radiation is due to sulfur 35, a pure beta emitter whose half life is 87 days and whose maximum energy beta particle is 0.169 Mev.

That body proteins may be altered by irradiation to such as extent as to react as foreign elements and perhaps antagonists in their own physiological environment is postulated. The plausibility of this concept was examined. The serological activity of hemocyanin isolated from the sera of the American lobster, as measured by the quantitative, turbidimetric precipitin reaction, was found to be altered by in vitro x irradiation. Beta particles from internally deposited P32 produced chronic changes in the specificity of some proteins of rat serum, and quantitative changes were observed in the serum albumin and globulin of x-irradiated animals. Increased concentrations of these components in the sera of normal animals produced reactions similar to serological reactions.

This technical report is intended as a brief description of the free convection problem existing in the various annuli of the SIR Mark A rotating plugs. It is by no means a complete report of the plug "hot tests", but merely records some of the more significant experimental observations and presents a few of the theories and calculations made to explain the observed free convection phenomenon. The general discussion which follows is chronological. Details of analyses are relegated to the Appendix.

The Grüneisen constant, as evaluated from the equation of state, is obtained for an Einstein solid. the presence of a state of finite hydrostatic pressure is taken into account explicitly by means of Murnaghan's theory of finite strain, to obtain the Grüneisen parameter's on the Debye and Einstein models. Results are identical in the two cases with the corresponding values obtained without use of the formal theory of finite strain.

Theory of operation and test results are given for a resistance type of liquid metal level instrument. The voltage across a steel rod in the tank is amplified by a magnetic amplifier and indicated by a milliammeter. Temperature compensation is provided for tank temperatures up to 1000 F.