We have measured the critical magnetic field for superconductivity In tungsten from 5.5 to 15 mK using a {gamma}-ray anisotropy thermometer, and we have measured the heat capacity between 0.35 and 25 K. Analysis of the data gives H{sub 0} = 1.237 Oe for the 0 K critical field, T{sub c} = 16.0 mK for the critical temperature, {gamma} = 1.008 mJ/mole K{sup 2} for the coefficient of the electronic heat capacity, and {Theta}{sub 0} = 383 K for the 0 K Debye temperature. The measured values of the critical field H{sub c} are consistently higher than those reported by Black, Johnson and Wheatley (BJW) on the CMN temperature scale, but the temperature dependence is similar. This discrepancy and the temperature dependence of H{sub c} suggest that both sets of H{sub c} data are affected by magnetic impurities. Use of the calorimetric {gamma} value permits an improved test of the CMN temperature scale with the very low temperature H{sub c} data obtained by BJW.

We present detailed measurements of the electron avalanche process in liquid Xenon. The measurements were made by using liquid-Xe-filled proportional chambers with anode diameters of 2.9, 3.5, and 5.0 {approx} to detect 279-keV y rays and measure the photopeak pulse height as a function of applied voltage. The use of uniform pulses of electrons enabled us to discriminate against secondary Townsend processes. We present a table of the first Townsend coefficient a as a function of electric field E; a typical value is {alpha} = (4.5 {+-} 0.3) x 10{sup 4} cm{sup -1} at E = 2 x 10{sup 6} V/cm. The electron avalanche occurs in liquid Xe at electric fields 26 times smaller than would be predicted using measurements made in gaseous Xe and E/{rho} density scaling.

Solid radioactive wastes resulting from chemical separations processing of spent reactor fuels have been disposed by burial in trenches in the 200 Areas since 1944. Solid radioactive wastes from other Hanford facilities and from off-site AEC contractors have also been buried in the 200 Areas` Waste Burial Grounds. Since 1970, industrial wastes containing or suspected of containing transuranic radionuclides have been packaged in concrete boxes and {open_quotes}dry wastes{close_quotes} have been packaged in steel boxes or drums and buried in segregated trenches. A land area of approximately 149 acres has been used to bury 5.2 million cubic feet of contaminated solid waste through calendar year 1971. Annual reports of radioactive solid waste burials issued, beginning in 1968, have shown land area used, and volume and quantity of radioactivity grams U and/or Pu and curies buried. No corrections for radioactive decay have been reported. In July 1972, J. D. Anderson, G. L. Hanson, G. R. Kiel, B. J. McMurray, and N. P. Nisick were assigned the responsibility for a study to provide the decayed inventory of radioactivity in each solid waste burial ground in the 200 Areas. The results of this study are included as Tables 1 and 2 in this report.

A comparison of the hazards involved in the existing process and the electrolytic process for dissolving plutonium metal shows that, in the opinion of the review team, no net increase in hazards will occur by operating the electrolytic dissolvers. This new process eliminates several hazardous operations such as metal burning and PuO/sub 2/ powder handling, and reduces operator time and, therefore, exposure. The new facility can be operated safely provided that the recommendations given previously are implemented.

WAZER Alchemy 7b (WA-7b) is a WAZER calculation of a laser-driven micro-implosion of a spherical capsule consisting of a thin gold pusher surrounded by a thick (frozen) deuterium ablator. The properties of the target capsule and the shape of the laser pulse used to irradiate it are described.

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Methods used to obtain evaluated neutron interaction and photon production data for /sup 238/U are described. (auth)

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Tests of a core restraint system employing external yokes to load and compact the reactor core were conducted using the Okanar Champing Model (PCM) test facility at HEDL.

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