This progress report from the Argonne National Laboratory covers the work in Biological and Medical Research, Radiological Physics, and Health services for the quarterly period ending March 31, 1952. Numerous experiments were conducted in an attempt to answer some of the questions arising from exposure to ionizing radiation, especially X radiation. Some of the research involved the radiosensitivity of cells and some involved animals. The effects of radium in humans was also evaluated. Other studies were performed in biology, such as the effect of photoperiodism on plant growth and the biological of beryllium.

The over-all objectives of this project encompassed testing the suitability of standard and special laundering methods and standard equipment for field decontamination of clothing; evaluating the contaminability and decontaminability of selected fabrics, and testing of experimental clothing monitoring instruments. Garments and fabrics contaminated by controlled methods were used during the operation for testing the equipment and evaluating fabrics and formulae. 8tandard Army laundering methods and equipment, including wooden washers, were effective for decontaminating clothing in the field. A decontaminating laundry formula employing citric acid and tartaric acid followed by either an organic or inorganic chelating agent results in a higher degree of decontamination than other formulae tested. The standard Quartermaster Corps mobile field laundry formula resulted in satisfactory decontamination with the type of soil and activity encountered and the cost of supplies is approximately one-tenth as much as the special formulae. Woolen garments and fabric swatches were decontanninated by laundering as readily as cotton or synthetic fabrics. Clothing monitoring instruments under development appear suitable for monitoring clothing under field conditions to determine the degree of contamination both before and after precessing. (auth)

Report presenting a simplified method for the solution of two-dimensional compressible flows through well-defined passages. Pressure distributions around four cascades of turbine blades and along the surface of a choked nozzle determined by the method are shown to compare well with experimental results.

Report presenting the results of an investigation of condensation phenomena in supersonic wind tunnel. Lower and upper limits for the degree of supersaturation attainable before the onset of condensation of air are discussed. A method is presented for calculating the properties of a stream containing a small fraction of condensed air.

From abstract: "This report presents the progress in the laboratory development of a continuous solvent recovery process for the tributyl phosphate-diluent mixture used in the Purex Process. Investigations were made with 1/2" diameter pulse columns, using a nine foot sodium carbonate contacting column and a four foot water wash column."

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Report issued by the U.S. Bureau of Mines discussing metallurgical and mineral fumes and dusts in Los Angeles County, California. Properties of dusts and fumes from different minerals are presented. This report includes tables, maps, illustrations, and photographs.

"An investigation has been conducted to determine experimentally the effects of compressibility on the flow past a bump and to compare the experimentally determined results with theory. Pressure measurements and Schlieren photographs were made of the flow past two bumps having thickness-chord ratios of 0.10 and 0.30 at Mach numbers between 0.20 and 0.84" (p. 1).

Report presenting an experimental investigation in order to determine the performance of a 90 degree cascade diffusing bend with an area ratio of 1.45:1, a 19-by-19-inch inlet, and five inlet boundary layers varying in thickness and shape parameter. Tests were performed over a range of Mach and Reynolds numbers. Results regarding velocity distribution, performance, and some general considerations for this configuration are provided.

Report presenting an investigation of boundary-layer suction through flush surface slots as a means for increasing the extent of laminar flow on the NACA 64A010 airfoil section. Results regarding slot modifications, suction distribution, and drag results are provided.

Note presenting wind-tunnel tests of the heat-transfer characteristics of the laminar and turbulent boundary layers on a cooled flat plate conducted at a nominal Mach number of 2.4. Data were obtained for a range of Reynolds numbers and nominal surface temperatures. Results regarding the Mach number distribution on flat-plate model, surface temperatures and heat-transfer rates, boundary-layer velocities profiles, temperature-recovery factor, and heat-transfer characteristics are provided.

Note presenting analytical expressions derived for the flapping, thrust, torque, and profile-drag power of a hinged rotor that are applicable to high-speed helicopters and to certain types of convertible aircraft.

Report presenting the laminar flame speed of 2,2,4-trimethylpentane with various oxygen-nitrogen mixtures as determined from schileren photographs of Bunsen-type flames. Some experimental results and theoretical predictions are provided. Testing occurred at 311 and 422 degrees Kelvin.

Note presenting several known methods of controlling the entry and exit of hydrogen in steel as correlated with the known chemical behavior of atomic and molecular hydrogen. Some of the results of testing and a newly proposed mechanism for hydrogen control are provided.

Report discussing the geology of the Quartz Creek pegmatite district of Gunnison County, Colorado. "The Quartz Creek pegmatite district includes an area of about 29 square miles in the vicinity of Quartz Creek in Gunnison County, Colorado. This area contains 1,803 pegmatites that are intruded into pre-Cambrian rocks."

A report regarding the geology of the Quartz creek Pegmatite District, in Gunnison County, Colordao

"An analysis of the gust and gust-load experience of a low-altitude transcontinental transport airplane, based on 834 hours of VGH record, is presented. The relation of gust experience to airspeed, altitude, season of the year, and flight condition is considered. An estimate of the overall gust history for the present type of operations is derived from a synthesis of the VGH data and available V-G data" (p. 1).

Studies of ionic entropies in methanol and ammonia have led to the suggestion that ionic entropies in water are abnormally high. An explanation of this hypothesis may be given in terms of entropies of solvation and the high degree of hydrogen bonding in water. When an ion enters water, more disorder is created than when it enters another, less hydrogen-bonded, solvent.

Discussed activities include: boiling consideration studies, C pile Panellit ranges and orifice sizes, testing of time delay relay, tube water flow studies, extrapolation of pile design data, temperature distributions in cold-sized canned J-slugs, pressure drop film studies, short tube mockup, film formation studies experiment, pile pressure drop increase studies, pile process specifications, loss of pile cooling water study, thermocouple slug, measurement of slug bond coefficients, slug temperature distribution, resistance heating of slugs, induction heating of slugs, shield temperatures with no water flow in the thermal shield cooling pipes, distortion and stress in the biological shields of B, D, and F piles, and studies of high density concrete for biological shields.

From summary: "Construction of the HRE facility was essentially complete on November 15, 1951 except for minor revisions and final testing. A program of engineering and nuclear tests of the system hasbeen drawn up, and the tests will be started early in the next quarter. The only major HRE items for which design is not complete are the samplers for the fuel, [gas], and reflector systems. These will be completed in time to be installed before critical experiments begin; meanwhile, temporary sampling devices have been installed for use during the testing program."

"The following account reviews the various stages of a research program relative to the high-lift devices on a swept wing by combined suction and blowing (jet action), with ejectors fed by air bled off (extracted) from the turbojet. After reviewing the essential principles of the boundary-layer control obtained by comparison with theory, the electric analogies and the wind-tunnel tests as well as the essential elements of ejector operations, the writers describe the tests made in the large tunnel at Chalais-Meudon on a full-scale model of the SO 6020 wing" (p. 1).

Low-speed pressure-recovery and surface-pressure measurements for a twin fuselage-side air-inlet arrangement intended for use at transonic speeds are presented. The model was developed by adding a canopy and nose-wheel fairing to basic transonic annular inlet studied in TN 2685. The results indicate shape requirements of fuselage nose, canopy, and nose-wheel fairing for maintaining substream surface velocities everywhere ahead of entrance.

Low-speed wind-tunnel tests were conducted as preliminary steps in the study of fuselage-air-inlet arrangements believed suitable for use at transonic speeds. The forward part of the model consisted of an NACA 1-85-050 cowling located at the base of the long protruding fuselage nose designed to maintain substream surface velocities everywhere ahead of the entrance and thereby to avoid or minimize adverse boundary-layer-shock interaction effects up to low supersonic speeds. Pressure-recovery and surface-pressure measurements are presented for the model with three fuselage nose shapes for ranges of angle of attack and inlet-velocity ratio useful for high-speed flight.

Report issued by the U.S. Bureau of Mines discussing mechanical mining processes in bituminous coal mines. As stated in the introduction, "this is the sixth of a series of publications that describe methods and practices in mining coal mechanically" (p. 1). This report includes tables, and illustrations.