Analyses of the present titanium-tritide RTNS targets are presented. These results include the hydrogen-isotope content of new and used targets, metallography, scanning electron microscopy, and hydrogen-isotope-diffusion calculations using a heat-flow finite-difference computer code. These latter calculations indicate that a combination of long target life and high neutron output is optimized when the rate of hydrogen isotope evolution from the target balances the deposition rate from the beam. Auger spectra show that carbon and oxygen species are present in the bulk and on the surface. (auth)

The work done with element 106 is reviewed, and a new experiment which bears on the properties of the isotope of mass 260 with atomic number 104 is discussed. It is noted that in the case of element 106 a link is demonstrated to the granddaughter as well as the daughter. (JFP)

None

Past liquid waste disposal practices at the U. S. Energy Research and Development Administration's Hanford Reservation have included the discharges of solutions containing trace quantities of actinides directly into the ground via structures collectively termed ''trenches''. Characterization of samples from two of these trenches, the 216-Z-9 and the 216-Z-1A(a), has been initiated to determine the present form and migration potential of plutonium stored in sediments which received high salt, acidic waste liquids. Analysis of samples acquired by drilling has revealed that the greatest measured concentration of Pu, approximately 10$sup 6$ $mu$Ci $sup 239$Pu/liter of sediment, occurs in both facilities just below the points of release of the waste liquids. This concentration decreases to approximately 10$sup 3$ $mu$Ci $sup 239$Pu/liter of sediment within the first 2 meters of the underlying sediment columns and to approximately 10 $mu$Ci $sup 239$Pu/liter of sediment at the maximum depth sampled (9 meters). Examination of relatively undisturbed sediment cores illustrated two types of Pu occurrence responsible for this distribution. One of these types is composed of Pu particles (greater than 70 wt percent PuO$sub 2$) added to the disposal site in the same form. This ''particulate'' type was ''filtered out'' within the upper 1 meter of …

We have studied uranium as a getter material under varying flow conditions using a uranium trap designed to remove tritium from inert gases. The uranium trap can remove any hydrogen isotope from an inert gas. We used mixtures of deuterium in argon at room temperatures. In the case of tritium, recovery is effected by heating the trap. A special segmented trap was designed to prevent channeling and to promote maximum reaction rates when gas flows through it. The gas mixtures were sampled at the trap inlet and outlet and were analyzed by a mass spectrometer. The results are expressed as a purification factor, which is the ratio of deuterium concentration at the inlet of the uranium trap to the concentration at the outlet. Purification factors vary inversely with both the ratio of deuterium to uranium already contained in the trap and with the rate of flow of gas through the trap. The effects of varying inlet deuterium concentrations on purification factors are also discussed. (auth)

High resolution x-ray spectral measurements are used to determine the relative intensity of He-like fluorine x-ray transitions, 2 $sup 3$P$sub 1$ $Yields$ 1 $sup 1$S$sub 0$ and $sup 1$P$sub 1$ $Yields$ $sup 1$S$sub 0$, produced in fluorine collisions with Ne, Ar, and Kr gas targets at various pressures and in thin carbon foils and a thick carbon slab. The relative intensities are observed to be strong functions of both target density and incident charge Z. These effects are attributed to strong collisional quenching of both initial states by subsequent large impact parameter collisions. The data permit extraction for the first time of the total quenching cross sections (sigma/sub Q/ ) for fast fluorine ions in both states. A strong enhancement of the relative intensity of the 2 $sup 3$P$sub 1$ is observed for F$sup 7+$ projectiles. This strong enhancement is attributed to selective excitation of metastable states in the beam, i.e., 1s2s $sup 3$S$sub 1$, into the 1s2p $sup 3$P$sub 1$ state. Finally, the data for foil and solid targets are used to obtain new information on the excitation states of ions moving in solids. High resolution measurements of the radiative electron capture (REC) peak are reported and analyzed for …

An investigation was made of a series of binary americium alloys with AB$sub 2$ stoichiometry (B = Al, Co, Fe, Rh and Ru) prepared from the $sup 243$Am isotope. The C-15 (MgCu$sub 2$-type) structure appears in AmAl$sub 2$, AmCo$sub 2$, AmFe$sub 2$, and AmRh$sub 2$, whereas AmRu$sub 2$ is isostructural with AmOs$sub 2$ which has the C-14 (MgZn$sub 2$-type) structure. The magnetic properties of the cubic americium laves phases were studied by means of magnetization and nuclear gamna-ray resonance (Moessbauer effect) measurements between 2.5 and 300$sup 0$K. All the cubic Laves phases studied, except AmFe$sub 2$, exhibit almost temperature-independent paramagnetism. The AmFe$sub 2$ sample is ferromagnetic with an estimated Curie temperature of approximately 400$sup 0$K. The hyperfine field at the Am site in all the compounds is small. The bulk magnetic moment of AmFe$sub 2$ (approximately 3 $mu$/sub B//F.U.) is thus associated only with the Fe atoms. The magnetic properties of the compounds are consistent with the assumption that the Am ion is in the +3 state (5f6). (auth)

Measurements of the deHaas-vanAlphen effect were performed in the intermetallic compounds URh$sub 3$ and UIr$sub 3$. Complex spectra were observed in both materials. Effective mass measurements were made for several orbits in URh$sub 3$ and values as large as 5.3 m$sub 0$ were observed. The relatively complete data in URh$sub 3$ are consistent with a complex multiply-connected Fermi surface which is in qualitative agreement with band structure calculations. The largest frequency branches in UIr$sub 3$ appear to have the same topology as their corresponding branches in URh$sub 3$. In addition, a number of closed low- mass surfaces exist in UIr$sub 3$ and are discussed in terms of the calculations for URh$sub 3$. (auth)

The difficult task of removing large pieces of highly contaminated equipment from an obsolete plutonium-239 facility was completed in a seven-month operation that included structural alteration of the process building. Detailed job planning, job execution and contamination control were major factors in accomplishing the task. (auth)

None

The literature on cryogenic hydrogen isotopes from 4.2 to 25$sup 0$K is reviewed for triple points, vapor pressures, liquid viscosities, surface tensions, and liquid and solid densities. Data are extrapolated to yield values for DT. Empirical equations are given for all isotopes for each property. At the estimated 19.71$sup 0$K triple point of 1:1 D-T in D$sub 2$-DT-T$sub 2$ solution, the estimated properties are: vapor pressure, 19,420 Pa (145.7 torr); viscosity 550 x 10$sup -7$ Pa.s; surface tension 4.23 x 10$sup -3$ N/m; liquid density, 0.0446 x 10$sup 6$ mol/m$sup 3$ (224 Kg/m$sup 3$); solid density, 0.051 x 10$sup 6$ mol/m$sup 3$ (256 Kg/m$sup 3$); and shrinkage upon freezing, -13 vol percent. At 4.2$sup 0$K, estimated values are: vapor pressure, 2.4 x 10$sup -10$ Pa (1.8 x 10$sup -12$ torr) and solid density, 0.053 x 10$sup 6$ mol/m$sup 3$ (267 Kg/m$sup 3$). (auth)

Changes occurring in high spin nuclear states are discussed. Experimental methods for studying reduction and eventual quenching of pairing interactions, changes in nuclear shapes, and alignment of individual particle angular momenta with increasing spin are reviewed. Emphasis is placed on the study of continuum gamma rays following heavy ion reactions. (12 figures) (SDF)

None

Recent research involving the direct computer simulation of plastic deformation through planar dislocation glide suggests that plastic inhomogeneities such as the formation and growth of discrete slip bands are an inherent feature of deformation through glide. The sources of glide inhomogeneity are described and the influence of temperature, microstructural barriers, and applied stress on the heterogeneity of deformation in idealized crystals is discussed.

Experiment needs for the LMFBR safety program are reviewed. The screening of reactor concepts which would meet the needs is described and a conceptual design for a new safety research experiment facility is presented. (JWR)

Assuming that the particle number is large, and using the leptodermous idealization that the ratio of the surface thickness to the cube root of nuclear volume is very small, an attempt is made to give an account of the time evolution of the shape of a nuclear system. It is suggested that a one-body, dissipation dominated approach to nuclear dynamics should be a reasonable starting point. (SDF)

The Savannah River Plant (SRP) has routinely and continuously monitored the local environment (land, water, air, flora, and fauna) since 1951. As part of this intensive program, a three-part study was made to assess the tritium migration from an onsite burial ground for solid nuclear wastes and the resulting dose-to-man. A major source of tritium is buried, massive, Li-Al residues (referred to as melts) from the thermal extraction step in the SRP tritium production process. A melt with its extraction crucible and lid were immersed in water to measure the amounts of tritium released as HTO and HT to the water and to air. The result was a rapid release of 23 curies, of which approximately 99 percent was HTO that remained in the immersion water, and 1 percent was HT that passed into the air. (auth)

None

An amplitude analysis of the reaction ..pi../sup +/p ..-->.. ..pi../sup +/..pi../sup -/..pi../sup 0/..delta../sup + +/ at 7 GeV/c was performed using the isobar model for the 3..pi.. system. The 3..pi.. mass covers the range 0.82 to 1.9 GeV. No significant A/sub 1/ production can be seen. The spin-parity of the ..omega..*(1700) is determined to 3/sup -/. Properties of A/sub 2/ and ..omega..* production are determined and compared with theoretical models. The background is similar to that seen in analyses of charged 3..pi.. systems.

None

The U.S. demand for lithium by the industrial sector and by a fusion power economy in the future is discussed. For a one million MW(e) CTR (D-T fuel cycle) economy, growing into the beginning of the next century (the years 2000 to 2030), the cumulative demand for lithium is estimated to range from (0.55 to 4.7) x 10/sup 7/ to 1.0 x 10/sup 9/ kg. Present estimates of the available U.S. supply are 6.9 x 10/sup 8/ kg of lithium from mineral resources and 4.0 x 10/sup 9/ kg of lithium from concentrated natural brines. There is, however, a vast supply of lithium in seawater: 2.5 x 10/sup 14/ kg. A preliminary process design for the extraction of lithium from seawater is presented: seawater is first evaporated by solar energy to increase the concentration of lithium and to decrease the concentration of other cations in the bittern which then passes into a Dowex-50 ion exchange bed for cation adsorption. Lithium ions are then eluted with dilute hydrochloric acid forming an aqueous lithium chloride which is subsequently concentrated and electrolyzed. The energy requirement for lithium extraction varies between 0.08 and 2.46 kWh(e)/gm for a range of production rates varying between 10/sup …

High-purity MgO crystals grown at ORNL were irradiated in the LLL 14.8- MeV Rotating Target Neutron Source (RTNS) to doses varying from 1.8 x 10$sup 15$ to 5.7 x 10$sup 17$ n/cm$sup 2$. The optical absorption spectra of these crystals resembled those irradiated in fission reactors and exhibited bands principally at 4.95, 3.5, 2.2, and 1.3 eV. The band with the largest absorption coefficient, that at 4.95 eV, is due to anion vacancies. The bands at 3.5 and 1.3 eV, attended by zero-phonon lines at 3.430 and 1.187 eV respectively, are attributed to different optical transitions of anion divacancies. The investigations indicate that the net production rates of the point defects resulting from irradiations with 14.8-MeV neutrons are about twice those resulting from fission neutrons in the Oak Ridge Reactor (ORR). This ratio is in reasonable accord with theoretical estimates based on damage energy calculations. (auth)

Procedures are described for isotopic analysis of large autopsy tissue samples for $sup 239$,$sup 240$Pu and $sup 238$Pu at Hanford. Internal tracers ($sup 242$Pu, $sup 236$Pu) are presently used to measure radiochemical recovery to an accuracy of +- 5 percent. Sample sizes may be up to at least 400g for soft tissues and up to 50g for bone with recoveries of 70 +- 30 percent. Some critical points of the procedure, problems and their solutions are discussed. (auth)

None