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  1. Radiation Resistant, Remotely Operated, High Capacity Spring Balance

    Ayer, J E ; Pokorny, G J - Review of Scientific Instruments
    A balance with a weighing range between 9 and 24 kg has been tested. The use of radiation resistant sensing devices makes it acceptable for use in hot cell applications. With an unrefined read-out method the system sensitivity, including resolution of chart reading by eye, at 65% confidence limits is ±10 g in 2.5-kg intervals. Over the entire 9 to 24 kg range the linearity of the system is such that the sensitivity is reduced to ±17 g. In conclusion, it is predicted that digital indication of weight and use of a low inertia, low friction indicating system will doublemore » the system sensitivity.« less

  2. Local atomic arrangements in gold-nickel alloys; Les arrangements atomiques locaux dans les alliages or-nickelDie Atomverteilung in Gold-Nickel Legierungen

    Flinn, P. A. ; Averbach, B. L. ; Cohen, Morris - Acta Metallurgica
    The local atomic arrangements in gold-nickel alloys are determined as a function of composition by observations of diffuse X-ray scattering. Measurements are made at – 190°C on alloys quenched from above the solubility gap, there being experimental evidence to show that the high temperature atomic configurations can be retained on quenching. The X-ray data reveal that these alloys exhibit a preference for unlike neighbors above the solubility temperature and have short range order analogous to that in copper-gold alloys. The sizes of the atoms in the solid solutions are also measured from the diffuse scattering. Further, the gold atom inmore » solution is smaller than in the pure metal, but larger than the average atomic dimension calculated from the lattice parameter of the solution. Correspondingly, the nickel atom in solution is larger than in the pure metal, but smaller than the average atomic dimension of the solution. Moreover, the size of each atom varies with the composition of the solution.« less

  3. X-Ray Study of Cold Work in Thoriated Tungsten

    McKeehan, M. ; Warren, B. E. - Journal of Applied Physics
    Spectrometer measurements were made of the x-ray diffraction peaks for cold-worked filings of thoriated tungsten: 99.25 tungsten, 0.75 thoria. A Fourier analysis was made of the peak shapes, and the instrumental broadening corrected by using the peaks of annealed material. When the particle size and the distortion effects were separated, it was found that the particle size broadening corresponded to a size L̄=200A. This value is to be interpreted as the size of the coherently diffracting domains, and is a measure of the distance between layers of slip planes or layers of dislocations. The coherent distortion broadening indicated that strainsmore » in this material vary appreciably over distances of 25A or less. Strain distribution curves were obtained from a Fourier transform of the experimental coefficients. There is an indication that strains are smaller in the larger coherent regions. The measured root mean square strain corresponds to an elastic energy of 0.18 cal/g. Finally, within experimental accuracy the integrated intensities are the same for the cold-worked or the annealed samples.« less

  4. Stabilization of Photomultiplier Tubes

    Sherr, R. ; Gerhart, J. B. - Review of Scientific Instruments
    By use of a circuit suggested by G. A. Morton, two methods for stabilizing output pulses from electrostatically focused photomultiplier tubes against supply voltage fluctuations have been investigated. Both are useful with such multipliers as the RCA 5819 and the RCA C7151. The same stabilizing circuit is used in each method, the difference resulting from the point in the dynode system at which the circuit is introduced.

  5. A Fixed-Focus Broad-Range Echelle Spectrograph of High Speed and Resolving Power

    Harrison, George R. ; Archer, James E. ; Camus, Jean - Journal of the Optical Society of America
    From the basic formulas governing echelle performance, simple expressions for echelle and groove dimensions are derived for producing a two-dimensional echelle spectrogram having any desired characteristics. Several possible mountings of Bausch & Lomb echelles having 200 grooves per inch and resolving powers in the range 200,000 to 500,000 have been tested with the objective of covering as much as possible of the spectral range 2000 to 7000A in a single exposure with high photographic speed. This type of spectrograph is of increasing importance for the analysis of complex spectra of materials available in only minute samples. The mounting thus farmore » found most satisfactory involves making the light from a horizontal slit parallel with an 8-inch concave mirror of 10.5-ft focus, placing the echelle with its grooves horizontal in the resulting collimated beam nearly over the slit, and illuminating a 21-ft concave grating with grooves vertical with the slightly diverging parallel beams from the echelle. The vertical plate factor thus produced on 30 inches of plate set in the focal plane at the grating normal varies from 0.47 A/mm at 7000A to 0.14A/mm at 2000A, and the spectral region from 7000 to 2000A can be covered in a single exposure at such dispersion. The reduction of optical parts to mirror, echelle, and grating gives high speed, so that exposure times of from 20 to 60 sec suffice for most arc spectra. To combine the echelle and grating characteristics effectively, the spectrum below 3600A is made to overlap in the second order of the grating that from 7200 to 3500A in the first. Measured resolving powers vary from 220,000 at 7000A to 450,000 or more at 2537A. Even in complex Zeeman spectra of the rare earths, the statistical distribution of lines is found to be such that little interference results from the partial overlapping of two grating orders. The spectral images are found to be stigmatic and sharp out to 15 inches on either side of the normal to the grating.« less

  6. A Count-Rate Method of Measuring Fast Neutron Tissue Dose

    Hurst, G. S. ; Ritchie, R. H. ; Wilson, H. N. - Review of Scientific Instruments
    The problem considered is that of measuring the fast neutron tissue dose. A special proportional counter has been designed whose response to collimated neutrons is such that the number of counts produced is approximately proportional to dose, when the neutron energy is between 0.2 Mev and 10 Mev. The response has been tested experimentally with monoergic neutrons of various energies between 365 kev and 5.2 Mev and at 14 Mev and is in good agreement with the dose curve.

  7. Beta-Gamma Polarization Correlations

    Hamilton, Donald R. ; Lemonick, Aaron ; Pipkin, Francis M. - Physical Review
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