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in subjects: "Irradiation"

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Tumor production in Syrian hamsters following inhalation of PuO/sub 2/--ZrO/sub 2/ aerosol

Syrian golden hamsters of both sexes were exposed to aerosols of ZrO/sub 2/ containing PuO/sub 2/. The starting material in the aerosol generator also had a small amount of /sup 57/Co added as a tracer. The mixture of all three constituents was nebulized and the droplets passed through a heating column at 1000/sup 0/C. Aerosol sampling was accomplished with a cascade impactor and electrostatic precipitator. The median aerodynamic diameters in all inhalation runs were approximately 2 ..mu..m wit… more

Date: January 1, 1978

Creator: Thomas, R. G. & Smith, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurements of the dependence of damage thresholds on laser wavelength, pulse duration and film thickness

Results of three experiments will be described. We used 351-nm and 355-nm pulses with durations of 0.6, 1, 5 and 9 ns measure thresholds for a variety of anti-reflectance and high reflectance coatings. The functional form t/sup m/, with t the pulse duration, was used to scale fluence thresholds measured at 0.6 ns to those measured at 9.0 ns. Values of the coefficient m ranged from 0.10 to 0.51. The average value was 0.30. In the second experiment, we measured thresholds at 1064 nm, 527 nm and 3… more

Date: March 1, 1984

Creator: Rainer, F.; Vercimak, C.L.; Milam, D.; Carniglia, C.K. & Tuttle Hart, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Irradiation experiment for lithium ceramics

Solid breeder materials are required in D-T fusion reactor blankets to convert fusion neutrons to tritium and thermal energy while providing some neutron shielding for the magnets. Lithium compounds such as Li/sub 2/O, LiAlO/sub 2/, Li/sub 4/SiO/sub 4/ and Li/sub 2/ZrO/sub 3/ have been proposed as solid breeder materials. Tritium is necessary to maintain the fuel supply for the D-T fusion reaction. No high burnup irradiation performance data is available for these materials in a neutron environ… more

Date: March 1, 1982

Creator: Hollenberg, G.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Clonal theory of radiation carcinogenesis

In some cases, usually involving high-LET radiations, the dose response at low doses follows a power function of dose with exponent less than one over a wide dose range. This type of response is of great interest since (a) it implies greater effect per unit dose at progressively smaller doses, and (b) it is not predicted by most models and theories of radiobiology. A theoretical framework is presented for responses having the above characteristics over a dose range extending over a factor of 10… more

Date: January 1, 1982

Creator: Baum, J.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of fission product behavior in the Saclay Spitfire Loop Test SSL-1. [HTGR]

The behavior of the fission metal cesium and the fission gases krypton and xenon in the Saclay Spitfire Loop SSL-1 test has been compared to that predicted using General Atomic reference data and computer code models. This is the first in a series of analyses planned in order to provide quantitative validation of HTGR fission product design methods. In this analysis, the first attempt to rigorously verify fission product design methods, the FIPERQ code was used to model the diffusion of cesium … more

Date: February 1, 1978

Creator: Jensen, D. D.; Haire, M. J. & Ballagny, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Radiation-induced segregation in HT-9 martensitic steel

Miniature notched-bar specimens of normalized and tempered HT-9 were neutron irradiated to approx.13 dpa and broken at liquid nitrogen temperatures in a UHV chamber. Fracture surfaces were analyzed using scanning Auger electron spectroscopy. Following irradiation at 410/sup 0/C, the fracture surface contained a small number of large relatively smooth facets, which are thought to be prior austenite grain boundaries. Strong segregation of Ni, Cr, Si, and P was detected at these surfaces, the rema… more

Date: January 1, 1986

Creator: Clausing, R.E.; Heatherly, L.; Faulkner, R.G.; Rowcliffe, A.F. & Farrell, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cesium-137 source material for an irradiator

The feasibility of using /sup 137/Cs for the gamma source in sludge irradiators is discussed. It was concluded that /sup 137/Cs, because of its availability in large quantities as a by-product of fission in nuclear reactors, is an excellent candidate source for use in sewage sludge irradiators. The capsules used to store /sup 137/CsCl in the Waste Encapsulation and Storage Facility embody the technology gained by extensive development and experience during the past 25 years. The WESF capsule pr… more

Date: January 1, 1980

Creator: Lamb, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

TRITOX: a multiple parameter evaluation of tritium toxicity

The increased use of nuclear reactors for power generation will lead to the introduction of tritium into the environment. The need for assessing possible immediate and long-term effects of exposure to this tritium led to the development of a broad program directed towards evaluating the possible somatic and genetic effects of continuous exposure to tritiated water (HTO). Among the parameters measured are the genetic, cytogenetic, reproductive efficiency, growth, nonspecific lifetime shortening,… more

Date: January 1, 1982

Creator: Carsten, A.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Edge-on ion irradiation of electron microscope specimens

A special technique is described for in situ transmission electron microscope (TEM) experiments involving simultaneous ion irradiation, in which the resultant phenomena are observed as in a cross-section TEM specimen. That is, instead of ion-irradiating the film or foil specimen normal to the major surfaces and observing in plan view (i.e., in the same direction), the specimen is irradiated edge-on (i.e., parallel to the major surfaces) and is observed normal to the depth direction with respect… more

Date: January 1, 1992

Creator: Otero, M. P. & Allen, C. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Stability of plutonium contaminated sediments in the Miami--Erie Canal. [Mound Facility, Ohio, radioactive effluents monitoring]

This study was conducted to evaluate the stability of plutonium-contaminated sediment in the Miami-Erie Canal. Correlations were sought to relate concentrations at air sampling stations to plutonium-238 concentrations in air and stack emissions, wind direction, particulate loading, rainfall, and construction activities. There appears to be some impact on airborne concentrations at air sampling stations 122 and 123 from the contaminated sediment in the canal and ponds area. For purposes of this … more

Date: March 1, 1978

Creator: Farmer, Billy M. & Carfagno, Daniel G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Atomic structure of clusters through chemical reactions

Techniques for the probing of isolated metal cluster structure through adsorbate binding patterns will be described. The saturation of clusters with reagents such as ammonia and nitrogen provides information on the number of preferred binding sites for these reagents. The dependence of this number on cluster size can suggest particular structural themes. The equilibrium reaction with water can be used to identify cluster sizes having especially enhanced binding for the water molecule. Again, th… more

Date: January 1, 1991

Creator: Riley, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

POWER REACTOR HIGH PERFORMANCE UO$sub 2$ PROGRAM. Progress Report Number 9, October 1, 1968--March 31, 1969.

No Description Available.

Date: January 1, 1969

Creator: Ogawa, S. Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Uncertainty in the power distribution for a fast reactor burnup cycle

Demonstration that advanced reactor designs satisfy safety and performance goals requires the analysis of uncertainties in calculated reactor characteristics. Two of the important performance characteristics of advanced liquid metal reactors (LMR) are the burnup reactivity swing and the local power peaking factor. Previous work reported a study of the uncertainty in the burnup reactivity swing attributable to nuclear data uncertainties for a typical advanced LMR design. The results are reported… more

Date: January 1, 1989

Creator: Downar, D.J.; Khalil, H. (Purdue Univ., Lafayette, IN (USA) & Argonne National Lab., IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Presence of UV-endonuclease sensitive sites in daughter DNA of UV-irradiated mammalian cells. [3H-thymidine tracer]

Asynchronous Chinese hamster cells were irradiated with 10 Jm/sup -2/ uv radiation and 0.25 to 4 hours later pulse-labeled with (/sup 3/H)thymidine. Cells synchronized by shaking off mitotic and G/sub 1/ cells were irradiated in either the G/sub 1/-phase or S-phase of the cell cycle and pulse-labeled with (/sup 3/H)thymidine in the S-phase. After a 12 to 14 hour chase in unlabeled medium, the DNA was extracted, incubated with Micrococcus luteus uv-endonuclease and sedimented in alkaline sucrose… more

Date: February 1, 1978

Creator: D'Ambrosio, S. & Setlow, R.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Growth rate of dislocation loop in Fe-Ni-Cr alloy under Kr sup + ion and electron irradiation

In order to examine the effect of irradiating particle species on the growth rate of radiation-induced dislocation loops, a solution-annealed Fe-25Ni-15Cr-0.02C alloy was irradiated at 723 K first by 1.5 MeV Kr{sup +} ions for 2520 sec, then by 1.5 MeV Kr{sup +} ions and 1.0 MeV electrons simultaneously for 780 sec, and finally by 1.0 MeV electrons for 780 sec with the HVEM-Tandem Facility in Argonne National Laboratory. The calculated damage rate by 1.5 MeV Kr{sup +} ions was 5.8 {times} 10{su… more

Date: October 1, 1991

Creator: Kimoto, T. (National Research Inst. for Metals, Tsukuba, Ibaraki (Japan)); Allen, C.W. & Rehn, L.E. (Argonne National Lab., IL (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pathfinder Atomic Power Plant Technical Progress Report, January 1962-March 1962

S>Progress is reported on the research and development program being performed in connection with the design of the Pathfinder Atomic Power Plant. The topics covered include: fuel material cladding, bonding, and irradiation testing; heat transfer and fluid flow; fuel element manufacturing research and development; low-enrichment superheater fuel element design; mechanical studies of control rods, guide tubes, and control rod drives; reactor physics; and reactor and system dynamics. (C.H.)

Date: June 30, 1962

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Solutions to heavy ion induced avalanche burnout in power devices

Silicon power devices fall into two broad categories, bipolar and field effect. Transistors using both of these technologies are often used in satellite applications for power conversion. The present trend is toward integrating power transistors and control electronics on the same chip. In this case, it is the power portion of the chip that is most susceptible to burnout failures, because of it's high voltage operation. Hence, it is important to understand the operational limitations of power t… more

Date: January 1, 1991

Creator: Wrobel, T. F. & Beutler, D. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Surface damage of molybdenum and TZM alloy under D/sup +/ impact

The surface damage of polycrystalline molybdenum and TZM alloy under 40-, 60-, and 120-keV D/sup +/ impact has been investigated for irradiation in both pulsed and continuous mode for total doses varying from 1.7 x 10/sup 17/ to 2.2 x 10/sup 19/ ions/cm/sup 2/ and for target temperatures verying from ambient temperature to 400/sup 0/C. Analysis by scanning electron microscopy of the MO samples held at ambient temperatures during D/sup +/ irradiations in both pulsed and continuous modes revealed… more

Date: January 1, 1977

Creator: Das, S.K.; Kaminsky, M. & Dusza, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pulsed CO sub 2 laser processing of thin ion-implanted silicon layers

We show that extremely shallow ({approx lt} 800 {Angstrom}) melt depths can be easily obtained by irradiating a thin heavily doped silicon layer with a CO{sub 2} laser pulse. Since the absorption of the CO{sub 2} laser pulse is dominated by free-carrier transitions, the beam heating occurs primarily in the thin degenerately doped film. For CO{sub 2} pulse-energy densities exceeding a threshold value, surface melting occurs and the reflectivity of the incident laser pulse increases abruptly to a… more

Date: January 1, 1988

Creator: James, R.B. (Sandia National Labs., Livermore, CA (United States)) & Christie, W.H. (Oak Ridge National Lab., TN (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

AN INFORMATION STORAGE AND RETRIEVAL SYSTEM FOR IRRADIATION EFFECTS IN METALS

An information storage and retrieval system (PIC) was developed, utilizing the IBM 7090 computer, for handling data pertaining to the effects of neutron irradiation on metals. The input includes a reference identification, an appropriate abstract or extract summarizing the article, code identification parameters analogous to those used by the ASM-SLA Literature Classification System, and special codes identifying relevant irradiation and testing parameters. The output contains the same data plu… more

Date: August 15, 1963

Creator: Bush, S. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Tensile and fracture properties of EBR-II-irradiated V-15Cr-5Ti containing helium

The alloy V-15Cr-5Ti was cyclotron-implanted with 80 appM He and subsequently irradiated in the Experimental Breeder Reactor (EBR-II) to 30 dpa. The same alloy was also irradiated in the 10, 20, and 30% cold-worked conditions. Irradiation temperatures ranged from 400 to 700/sup 0/C. No significant effects of helium on mechanical properties were found in this temperature range although the neutron irradiation shifted the temperature of transition from cleavage to ductile fracture to about 625/su… more

Date: January 1, 1986

Creator: Grossbeck, M.L. & Horak, J.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

INOCULATED PACK STUDIES ON CLOSTRIDIUM BOTULINUM TYPE E IN UNIRRADIATED AND IRRADIATED HADDOCK.

No Description Available.

Date: October 31, 1969

Creator: Segner, W.P. & Schmidt, C.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Some properties of the log-Laplace distribution

A random variable Y is said to have the Laplace distribution or the double exponential distribution whenever its probability density function is given by lambda exp(-lambda abs. value y), where -infinity < y < infinity and lambda > 0. The random variable X = exp(Y) is said to have the log-Laplace distribution. With the problem of extrapolation to low doses in dose response curves as motivation, an axiomatic characterization of the log-Laplace distribution is obtained. 1 figure.

Date: January 1, 1980

Creator: Uppuluri, V.R.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Work on surveillance dosimetry and benchmarks used for US power reactors and for irradiation experiments

No Description Available.

Date: January 1, 1991

Creator: Kam, F. B. K. & Stallmann, F. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department