281 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Radiation Effects"  
Results: 1 - 24 next
open access

Vacuum ultraviolet electronic properties of liquids. Annual progress report, 1 November 1979-31 October 1980

Description: Areas covered are: optical and dielectric properties of hexamethyl-phosphoric triamide; photoemission from uv irradiated liquids; photon and photoelectron mean free paths in liquids; properties of Kapton films; and uv transmission of polycyclic organic molecules. (GHT)
Date: January 1, 1980
Creator: Painter, L.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Metals and Ceramics Division. Annual progress report, ending June 30, 1980

Description: Research is reported concerning: (1) engineering materials, including materials compatibility, mechanical properties, nondestructive testing, pressure vessel technology, and welding and brazing; (2) fuels and processes consisting of ceramic technology, fuel cycle technology, fuels evaluation, fuel fabrication and metals processing; and (3) materials science which includes, ceramic studies, physical metallurgy properties, radiation effects and microstructural analysis, metastable and superconduc… more
Date: September 1, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Early events in irradiated water. [5-keV electrons]

Description: We propose a model to continue following events from the initial energy deposition (<10/sup -15/ s) through later times at which liquid water can begin to respond chemically to the passage of radiation. We use a Monte Carlo code to calculate the spatial distributions of the chemical species present at times of about 10/sup -11/ s. This information provides the necessary input for diffusion-kinetic calculations to predict the subsequent chemical evolution of the system and measurable transient a… more
Date: January 1, 1980
Creator: Turner, J.E.; Magee, J.L.; Hamm, R.N.; Chatterjee, A.; Wright, H.A. & Ritchie, R.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radiation protection: an analysis of thyroid blocking. [Effectiveness of KI in reducing radioactive uptake following potential reactor accident]

Description: An analysis was performed to provide guidance to policymakers concerning the effectiveness of potassium iodide (KI) as a thyroid blocking agent in potential reactor accident situations, the distance to which (or area within which) it should be distributed, and its relative effectiveness compared to other available protective measures. The analysis was performed using the Reactor Safety Study (WASH-1400) consequence model. Four categories of accidents were addressed: gap activity release acciden… more
Date: January 1, 1980
Creator: Aldrich, D.C. & Blond, R.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Direct observations of the primary state of radiation damage of ion-irradiated tungsten and platinum

Description: A brief summary was presented of all the Cornell work on the primary state of radiation damage in ion-irradiated tungsten and platinum. The primary research tool for all this research was the field-ion microscope (FIM); the FIM was ideally suited for this research because of its excellent atomic resolution and the ability to examine the interior of the specimens, as a result of the field-evaporation effect. This paper summarized, in outline form, the following items: (1) the principal experimen… more
Date: July 1, 1980
Creator: Seidman, D. N.; Current, M. I.; Pramanik, D. & Wei, C. Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

CRBRP reactor system shield design and impact of new materials irradiation damage data

Description: Structural materials radiation damage data have received considerable attention in the design of LMFBR permanent reactor structures. A recent FFTF/CRBRP structural materials irradiation experiment, conducted as part of the national program plan for irradiation effects on mechanical properties of LMFBR out-of-core structural materials, has found engineering application in setting energy-dependent neutron exposure limits of irradiated structures. This paper describes the impact of the new irradia… more
Date: January 1, 1980
Creator: Wrights, G.N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LWR-PV damage estimate methodology

Description: A credible estimate of the pressure vessel lifetime due to neutron-induced embrittlement is studied. The first step toward this goal is the accurate prediction of fluence and neutron energy spectrum at the pressure vessel. This, in turn, is obtained from least squares unfolding techniques of dosimetry measurements at a surveillance position, transport calculations, and a translation of information obtained at the surveillance position to the damage position. Including a prototypic neutron field… more
Date: January 1, 1980
Creator: Wagschal, J.J.; Maerker, R.E. & Broadhead, B.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Some properties of the log-Laplace distribution

Description: 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: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Expected environments in high-level nuclear waste and spent fuel repositories in salt

Description: The purpose of this report is to describe the expected environments associated with high-level waste (HLW) and spent fuel (SF) repositories in salt formations. These environments include the thermal, fluid, pressure, brine chemistry, and radiation fields predicted for the repository conceptual designs. In this study, it is assumed that the repository will be a room and pillar mine in a rock-salt formation, with the disposal horizon located approx. 2000 ft (610 m) below the surface of the earth.… more
Date: August 1, 1980
Creator: Claiborne, H.C. & Rickertsen, L.D., Graham, R.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical properties of chemical vapor deposited coatings for fusion reactor application

Description: Chemical vapor deposited coatings of TiB/sub 2/, TiC and boron on graphite substrates are being developed for application as limiter materials in magnetic confinement fusion reactors. In this application severe thermal shock conditions exist and to do effective thermo-mechanical modelling of the material response it is necessary to acquire elastic moduli, fracture strength and strain to fracture data for the coatings. Four point flexure tests have been conducted from room temperature to 2000/su… more
Date: January 1, 1980
Creator: Mullendore, A. W.; Whitley, J. B.; Pierson, H. O. & Mattox, D. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Approach to testing fusion components in existing nuclear facilities

Description: The concept presented makes use of the fast spectrum in the Engineering Test Reactor (ETR) at the Idaho National Engineering Laboratory (INEL). Preliminary results show that an asymmetric, nuclear test environment with particle and radiant energy fluxes impinging on a first wall/blanket or divertor surface appears feasible in a neutron/gamma field not greatly different from that seen by a representative first wall/blanket module.
Date: January 1, 1980
Creator: Hsu, P. Y.; Miller, L. G.; Longhurst, G. R.; Masson, L. S. & Kulcinski, G. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Role of gas pressure and lateral stress on blistering

Description: Both gas pressure in bubbles and lateral stress have been suggested as primary causes of blistering. An analysis of both mechanisms is presented, and the conditions for blistering are examined. To realistically predict the gas pressure in bubbles, a recently derived high-density equation of state for helium is utilized.
Date: April 1, 1980
Creator: Wolfer, W. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Some properties of the log-Laplace distribution

Description: A random variable ..gamma.. is said to have the Laplace distribution or the double exponential distribution whenever its probability density function is given by lambda exp(-lambda absolute value (y)), where -infinity < y < infinity and lambda > 0. The random variable X = exp(..gamma..) is said to have the log-Laplace distribution. With the problem of extrapolation to low doses in dose response curves as a motivation, an axiomatic characterization of the log-Laplace distribution is obtained. 1 … more
Date: August 1, 1980
Creator: Uppuluri, V.R.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Postirradiation cladding strength under biaxial loading with an increasing temperature ramp. [LMFBR]

Description: The flow behavior of unirradiated 20% cold worked AISI 316 tubing during constant pressure, increasing temperature tests was modeled with a constitutive relation approach; strain below approximately 0.2% came predominantly from an anelastic portion of the model while higher strains were predominantly plastic. The flow of cladding sections from irradiated fuel pins was largely restricted to the strain region attributed to anelastic deformation due to reduced ductility compared to unirradiated tu… more
Date: April 1, 1980
Creator: Duncan, D. R. & Hunter, C. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of new techniques of using irradiation in the genetic improvement of warm season grasses, the assessment of their genetic and cytogenetic effects and biomass production from grass. Annual progress report, November 1, 1979 to October 31, 1980

Description: New techniques are described for using irradiation and chemical mutagens in the genetic improvement of several warm season grasses. Genetic and cytogenetic effects of these treatments are also being studied. (ACR)
Date: January 1, 1980
Creator: Burton, G W & Hanna, W W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Three year progress report and renewal request

Description: A review of research accomplisments during the contract period is presented. Reported projects include: (1) metals as radiation sensitizers of spores; (2) studies on transforming and calf thymus DNA; (3) pulse radiolysis studies on DNA components; (4) studies of metal complexes of DNA compounds; and (5) dosimetry of the pulsed electron beam. (ACR)
Date: August 1, 1980
Creator: Powers, E. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comprehensive neutron cross-section and secondary energy distribution uncertainty analysis for a fusion reactor

Description: On the example of General Atomic's well-documented Power Generating Fusion Reactor (PGFR) design, this report exercises a comprehensive neutron cross-section and secondary energy distribution (SED) uncertainty analysis. The LASL sensitivity and uncertainty analysis code SENSIT is used to calculate reaction cross-section sensitivity profiles and integral SED sensitivity coefficients. These are then folded with covariance matrices and integral SED uncertainties to obtain the resulting uncertainti… more
Date: May 1, 1980
Creator: Gerstl, S.A.W.; LaBauve, R.J. & Young, P.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Single atom sputtering events: direct observation of near-surface depleted zones in ion-irradiated tungsten

Description: The three-dimensional spatial arrangement of vacancies contained in depleted zones (DZs), of ion-irradiated tungsten specimens, was determined with atomic resolution by the field-ion microscope (FIM) technique. These DZs were detected in the near-surface region of specimens which had been irradiated in situ at less than or equal to15 K with 20 keV W/sup +/, 30 keV W/sup +/, Kr/sup +/, Cu/sup +/, or Ar/sup +/ ions. The values of the ion dose employed were small (less than or equal to 10/sup 13/ … more
Date: March 1, 1980
Creator: Current, M. I.; Wei, C. Y. & Seidman, D. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dose-rate conversion factors for external exposure to photons and electrons

Description: This paper describes recent modifications of the computer code DOSFACTER, which was developed for the purpose of estimating dose-rate conversion factors for external exposure to photons and electrons emitted by radionuclides dispersed in the environment. The modifications and additions which have been made to the calculations outlined above include the following: (1) calculation of electron dose-rate factors for radiosensitive portions of the skin; (2) incorporation of improved estimates of org… more
Date: January 1, 1980
Creator: Kocher, David C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reactor calculation benchmark PCA blind test results

Description: Further improvement in calculational procedures or a combination of calculations and measurements is necessary to attain 10 to 15% (1 sigma) accuracy for neutron exposure parameters (flux greater than 0.1 MeV, flux greater than 1.0 MeV, and dpa). The calculational modeling of power reactors should be benchmarked in an actual LWR plant to provide final uncertainty estimates for end-of-life predictions and limitations for plant operations. 26 references, 14 figures, 6 tables.
Date: January 1, 1980
Creator: Kam, F.B.K. & Stallmann, F.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Frank loop unfaulting mechanism in fcc metals during neutron irradiation

Description: The unfaulting mechanism whereby sessile Frank dislocation loops evolve into a complex tangle of glissile dislocations during irradiation of face centered cubic metals is not well understood. It is presumed that such loops grow by absorption of point defects until interactions develop which provide sufficient impetus for nucleation of an unfaulting event. The loops then become glissile, interact and form a dislocation network. An alternate mechanism which has been observed to occur in an austen… more
Date: May 1980
Creator: Gelles, D. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hydrogen-Transfer and Charge Transfer in Photochemical and High Energy Radiation Induced Reactions: Effects of Thiols. Final Report, February 1, 1960-January 31, 1979

Description: Absorption of ultraviolet or visible light, or high energy radiation, may lead to highly reactive free radicals. Thiols affect the reactions of these radicals in the following ways: (1) transfer of hydrogen from sulfur of the thiol to a substrate radical, converting the radical to a stable molecule, and the thiol to a reactive thiyl radical; and (2) transfer of hydrogen from a substrate radical or molecule to thiyl, regenerating thiol. The thiol is thus used repeatedly and a single molecule may… more
Date: March 1, 1980
Creator: Cohen, S. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Damage parameters for non-metals in a high energy neutron environment

Description: Simulation of radiation damage induced in monatomic and binary non-metals by FMIT and fusion neutrons is described. Damage produced by elastic scattering of recoil atoms and by ionization-assisted processes has been evaluated using the damage program DON. Displacement damage from gamma rays has been evaluated by using the technique of Oen and Holmes. A comparison of damage for an anticipated FMIT radiation environment generated by a coupled n-..gamma.. transport calculations and a fusion spectr… more
Date: January 1, 1980
Creator: Dell, G F; Berry, H C; Lazareth, O W & Goland, A N
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Does oxygen enhance the radiation-induced inactivation of penicillinase. Progress report, December 1, 1979-November 30, 1980

Description: The radiation-induced inactivation of penicillinase in dilute aqueous solutions buffered with phosphate was studied, by examining enzyme radiosensitivity in the presence of various gases (He, O/sub 2/, H/sub 2/, N/sub 2/O, N/sub 2/O + O/sub 2/). The introduction of either N/sub 2/O or O/sub 2/ was found to reduce the radiodamage. On the other hand H/sub 2/ or N/sub 2/O + O/sub 2/ gas-mixture enhanced the radiosensitivity. In the presence of formate and oxygen, no enzyme inactivation was detecte… more
Date: January 1, 1980
Creator: Samuni, A.; Kalkstein, A. & Czapski, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen