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This second edition is based on data available on March 15, 1961. Sections on constants necessary for the interpretation of experimental data and on digital computer programs for reactor design and reactor physics have been added. 1344 references. (D.C.W.)

A revolving drum camera--oscilloscope data display and recording system was assembled. It provides an effective photographic sensitivity an order of magnitude greater than that previously reported for utilization in time-resolved mass spectrometer analyses of rapidly occurring physical and chemical processes. A gas phase flash heating phenomenon, recorded with a Bendix TOF Mass Spectrometer operating at 20 kc, is cited as an application of the improved data recording system and as an example of timesaving data reduction procedures. (auth)

Activities in a program to collect radioactive effluents released during the test operation of a Kiwi reactor (Kiwi B-la) on December 7, 1961, are reported. Granular fallout collectors and cheesecloth aerosol collectors were prelocated along roads approximating arcs of 5, 16, and 37 miles from the reactor test cell at the Nevada Test Site. Each of these arcs crossed successively lower and wider parts of a gently sloping valley. A last-minute shift in wind direction carried the effluent cloud away from the prelocated sampling devices. Apparently, the cloud was trapped until nightfall in an inversion layer from 2000 to 3500 feet above the surface. During the night following the reactor test, tropospheric or stratospheric fallout probably derived from nuclear detonations in the U.S.S.R. (but no short-lived fission products) were deposited on the abovementioned sampling devices. The shallow-valley inversion and cold air drainage caused the pattern of this deposition to be closely related to the local topography. The betagamma activity deposited on samplers at low elevation (presumably below the valley inversion layer) was less than that deposited on samplers at higher eleveations. The highest levels of beta-gamma activity were detected on samplers which had been located direcly in the most probable …

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Results are reported for tensile and notched tensile tests on unirradiated and irradiated A-302B steel. The tensile results indicate that neutron irradiation decreases the uniform strain, increases the yield point, and decreases the strain hardening. The notched tensile results showed an increase in the ultimate tensile strength with irradiation. (D.L.C.)

Design and operation of an electronic ripple filter to be used with the Brooknaven alternating-gradient synchrotron during flattop at energies between 10 and 30 Bev are discussed. (D.C.W.)

Calculations were performed to determine the upward going muon flux leaving the earth's surface after production by cosmic-ray neutrinos in the crust. Only neutrinos produced in the earth's atmosphere are considered. Rates of the order of one per 100 sq m/day might be expected if an intermediate boson exists and has a mass less than 2 Bev. (auth)

Alpha-gamma angular correlation measurements were made with solid sources of Am/sup 243/ and with liquid sources containing either Am/sup 243/ or an even-even alpha emitter in dilute perchloric acid solutions. Even-even alpha emitters studied are U/sup 232/, Th/sup 230/, and Ra/sup 226/ . Thicknesses of the soli d sources were controlled so that the neptunium recoils from one source were stopped in Am/sub 2/O/sub 3/, while recoils from the other sources were stopped in the aluminum, gold, or mica backing on which the sources were vaporized. The liquid sources were films consisting of 3 microliters of solution placed between a rubber hydrochloride membrane and a microscope cover glass, 1 cm/sup 2/ in circular cross section. The perchloric acid concentration of the liquid sources ranged from 0.5 to 3.0 molar. All of the angular correlations obtained with solid Am/sup 243/ sources were attenuated, the average attenuation coefficients being 0.29 450 deg C in a 0.01 for sources in which recoils were stopped in Am/sub 2/O/sub 3/, 0.20 450 deg C in a 0.01 for sources in which recoils were stopped in mica, 0.52 450 deg C in a 0.02 for sources in which recoils were stopped in gold, and 0.67 450 …

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Developmental activities are reported on Borax-V, EBR-I, EBR-II, FARET, general reactor technology, and advanced reactor research. Other work is reported on the Pu recycle program and nuclear safety. (J.R.D.)

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The effect of irradiation on the hydrolytic behavior of uranium monocarbide as related to the aqueous chemical processing of these reactor fuels is being investigated. The fabrication, evaluation, and encapsulation of the UC in niobium prior to irradiation is described. Uranium monocarbide buttons were prepared by arc-melting 1.51%enriched uranium metal with the stoichiometric quantity of spectroscopic-grade carbon. The buttons were then remelted and drop- cast into graphite thimbles 3/8 in. dia, and 3 in. long. The cylindrical castings were surface ground and cut into 0.17 in.-thick pellets, which were then polished. Preirradiation evaluation included metallography, chemical analysis, and hydrolysis studies. Microstructures of the final pellets indicated that the monocarbide was nearly stoichiometric; however, some alpha -uranium was present along with carbon contamination from the graphite thimbles. The use of tungsten- tipped electrodes in the arc-melting operation introduced about 0.3% of tungsten impurity. The composition of the pellets, as estimated from hydrolysis studies and chemical analyses was 92% UC, 3.5% UC/sub 2/, 4.0% uranium metal, and 0.3% WC. The UC pellets were encapsulated in niobium and subsequently shrunk-fit into a stainless steel cladding. The capsules were sealed by heliarc welding in a helium atmosphere chamber. (auth)

>Effective activation resonance integrals for thin and thick foils in an isotropic neutron flux were measured by a cadmium ratio method. Gold was used as a standard. Values obtained for dilute resonance integrals in barns, not including 1/v capture, were: Au/sup 197/, 1390 plus or minus 40 (Reference); U/ sup 238/ capture, 280 plus or minus 10; Cu/sup 63/, 3.17 plus or minus 0.18; Cu/sup 65/, 1.39 plus or minus 0.22; Mo/sup 98/, 9.9 plus or minus 1.1; Mo/sup 100/, 4.06 plus or minus 0.23; W/sup 186/, 476 plus or minus 50; and Na/sup 23/ , 0.075 plus or minus 0.010. Dilute resonance integrals including 1/v capture above 0.60 ev were: U/sup 235/ fission, 263 plus or minus 9 and In is, 3200 plus or minus 100. These resonance integrals and the measured resonance flux self-shielding factors were generally in good agreement with calculations. However, the two isotopes of molybdenum appeared to have major contributions to their resonance integrals from nontabulated resonances. Special methods used with various foils are described. (auth)

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Experimental data for frequency response obtained from a linear dynamic system were processed to obtain the transfer function as a ratio of two frequency- dependent polynomials. The difference between the absolute magnitudes of the actual function and the polynomial ratio was the error considered. The polynomial coefficients were evaluated as the result of minimizing the sum of the squares of the errors at the experimental points. The magnitude and phase angle of the transfer function were evaluated at various frequencies by means of the computed polynomial ratio and were compared with the observed data. The numerical solution of this problem was obtained by using an IBM 704 FORTRAN program. The method presented gives an analytic description of the complex transfer function superior to that given by minimization of the weighted'' sura of the squares of the errors in magnitude. This method is applicable to both minimum and non-minimum phase systems. (auth)

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A discussion is presented of an investigation of the flow characteristics in a horizontal, converging-diverging nozzle for a two-phase, air- water system. The primary consideration, to determine the effects of accelerating the liquid phase by the gaseous phase, was measured in terms of nozzle exit water velocity, exit slip ratio, and exit acceleration factor. A gamma-ray-attenuation technique was used to determine these values by determining the average cross-sectional void fraction, the ratio of gas volume to total volume, for the air-- water mixture. (B.O.G.)

Measured values of the three low-pressure spall thresholds in copper plate are presented. The two lower thresholds are original with this program. However, the incipient spall threshold or beginning of tensile damage corresponds rather closely in magnitude to the dynamic elastic yield strength of copper in compression. The complete spall threshold corresponds to the value determined by Rinehart for copper. Thresholds are presented in terms of pressure and pulse- width, and the effect of varying the pulsewidth with a given pressure is shown. The experimental methods, including properties of the compressed-air gun, are discussed since they are applicable to most metals and many nonmetels. (auth)

An experimental flight test was made to verify and improve the methods and techniques used to predict the aerothermodynamic effects on re-entering SNAP devices. The amount of aerodynamic heating as a function of body shape, size, and mode of entry was indicated. Test specimens yielded trajectory, aerodynamic heating data, heat distribution, and heat transfer of known bodies. IBM 7090 digital programs were utilized and so constructed that one digital code complemented the other, i.e., at any time during the re-entry period, the complete thermal history of the body is known. The test specimens consisted of lead bodies containing alkali metals, used as flaring material, and a larger titanium cylinder containing telemetry equipment to monitor the exterior and interior wall temperatures during re-entry. By judicious placement of transducer sensors, aerodynamic heating rates and mode of entry, i.e., tumbling, spinning, and/or stabilized, were determined. The lead bodies were consumed at high altitudes whereas the telemetry capsule survived re-entry. (auth)