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Radioisotopes at Work for Agriculture

Description: Introduction: The Office of Isotopes Development of the United States Atomic Energy Commission has requested that Stanford Research Institute prepare a report on the applications of radioisotopes in agriculture.
Date: October 1959
Creator: Homan, A. Gerlof & Tarrice, Richard R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Use of fluorescent screens for isotope radiography

Description: Radiographic examination can be performed on items beyond the limitation of conventional isotope radiography without a great loss of resolution. With proper film and screen selection and scatter radiation control, fluorescent screens can be a valuable additional tool for radiography.
Date: January 1, 1979
Creator: Hubbard, S. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Budgets and behaviors of uranium and thorium series isotopes in the Santa Monica Basin off the California Coast

Description: Samples from three time-series sediment traps deployed in the Santa Monica Basin off the California coast were analyzed to study the flux and scavenging of uranium and thorium series isotopes. Variations of uranium and thorium series isotopes fluxes in the water column were obtained by integrating these time-series deployment results. Mass and radionuclide fluxes measured from bottom sediment traps compare favorably with fluxed determined from sediment core data. This agreement suggests that th… more
Date: December 16, 1991
Creator: Yu, Lei.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of resin-bead isotope-dilution mass spectrometric techniques for Tc-99 analysis

Description: An isotope dilution mass spectrometric method was developed for the analysis of Tc-99 after isolating it onto anion exchange resin beads. A single resin bead containing Tc-99 and Tc-97 spike is loaded onto a rhenium V-shaped filament for thermal emission mass spectrometry. The application of this technique requires the use of a mass spectrometer of high abundance sensitivity and pulse counting capability for the necessary ion detection sensitivity. This paper discusses the development of the te… more
Date: January 1, 1979
Creator: Walker, R.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Low capacitance large volume shaped-field germanium detector

Description: A large volume (150 cm/sup 3/) germanium detector with a full- depletion capacitance of only approx.1 pf has been fabricated. The effect of impurity space-charge was utilized to obtain an appropriate electric field distribution in the detector so that carriers are collected on a small area electrode. Detectors based on this principle are capable of very low noise operation and have immediate applications in direct detection dark matter particle experiments. Detector pulse shapes and carrier tra… more
Date: October 1, 1988
Creator: Luke, P. N.; Goulding, F. S.; Madden, N. W. & Pehl, R. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Kinetics of total body retention and clearance of xenon and krypton after inhalation. [/sup 127/Xe, /sup 79/Kr, /sup 85/Kr]

Description: The total body retention of Xe-127 and Kr-79 and their clearance rates following inhalation were measured in vivo. These data are useful for refined Xe-127 dosimetry calculations, to determine the potential radiation hazard of fission product Kr-85, and more generally to study the behavior of anesthetic gases. While data are available on the solubilities and partition coefficients of Xe and Kr in fat, blood, and other individual body constituents, few measurements of their retention and clearan… more
Date: January 1, 1976
Creator: Susskind, H.; Atkins, H. L.; Cohn, S. H.; Ellis, K. J. & Richards, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Tritium monitor for fusion reactors

Description: This report describes the design, operation, and performance of a flow-through ion-chamber instrument designed to measure tritium concentrations in air containing /sup 13/N, /sup 16/N, and /sup 41/Ar produced by neutrons generated by D-T fusion devices. The instrument employs a chamber assembly consisting of two coaxial ionization chambers. The inner chamber is the flow-through measuring chamber and the outer chamber is used for current subtraction. A thin wall common to both chambers is opaque… more
Date: August 1, 1982
Creator: Jalbert, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal Analysis of LANL Ion Exchange Column

Description: This document reports results from an ion exchange column heat transfer analysis requested by Los Alamos National Laboratory (LANL). The object of the analysis is to demonstrate that the decay heat from the Pu-238 will not cause resin bed temperatures to increase to a level where the resin significantly degrades.
Date: June 16, 1999
Creator: Laurinat, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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State of the science of blood cell labeling

Description: Blood cell labeling can be considered a science in as far as it is based on precise knowledge and can be readily reproduced. This benchmark criterion is applied to all current cell labeling modalities and their relative merits and deficiencies are discussed. Mechanisms are given where they are known as well as labeling yields, label stability, and cell functionality. The focus is on the methodology and its suitability to the clinical setting rather than on clinical applications per se. Clinical… more
Date: January 1, 1989
Creator: Srivastava, S. C. & Straub, R. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Detecting isotopic ratio outliers

Description: An alternative method is proposed for improving isotopic ratio estimates. This method mathematically models pulse-count data and uses iterative reweighted Poisson regression to estimate model parameters to calculate the isotopic ratios. This computer-oriented approach provides theoretically better methods than conventional techniques to establish error limits and to identify outliers. 6 refs., 3 figs., 3 tabs.
Date: January 1, 1985
Creator: Bayne, C.K. & Smith, D.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiolabeled red blood cells: status, problems, and prospects

Description: Radionuclidic labels for red cells can be divided into two main categories - cohort or pulse labels, and random labels. The random labels are incorporated into circulating cells of all ages and the labeling process is usually carried out in vitro. The red cell labels in predominant use involve random labeling and employ technetium-99m, chromium-51, indium-111, and gallium-68, roughly in that order. The extent of usefulness depends on the properties of the label such as the half-life, decay mode… more
Date: January 1, 1983
Creator: Srivastava, S.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New ideas in dosimetry and damage calculations for fusion materials irradiations

Description: Nuclear data and techniques are being developed to improve our ability to characterize fusion materials irradiations in terms of neutron fluence and spectra as well as damage parameters such as atomic displacements, gas production, and other transmutation. The production of long-lived isotopes are being measured near 14 MeV, including reactions from Al, Fe, and Mo to /sup 26/Al, /sup 53/Mn, and /sup 94/Nb, and measurements for other reactions are in progress. These data can be used for fusion r… more
Date: January 1, 1986
Creator: Greenwood, L.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Monitoring tritium in air containing other radioactive gases

Description: A brief survey is presented of methods that have been developed for active tritium monitoring that may be applied to measure tritium concentrations in air containing /sup 13/N, /sup 16/N, and /sup 41/Ar produced by D-T neutrons. Included are instruments that employ current subtraction to achieve discriminations and others that selectively remove atmospheric water vapor from stream of activated air.
Date: September 1, 1982
Creator: Jalbert, Roland A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Half-Lives of Long-Lived a-Decay, B-Decay, Bb-Decay and Spontaneous Fission Nuclides.

Description: In his review of radionuclides for dating purposes, Roth noted that there were a large number of nuclides, normally considered ''stable'' but which are radioactive with a very long half-life. Roth suggested that I review the data on the half-life values of these long-lived nuclides for a discussion session at the next meeting. These half-life values for long-lived nuclides include those due to various decay modes, {alpha}-decay, {beta}-decay, electron capture decay, {beta}{beta}-decay and spont… more
Date: June 29, 2001
Creator: Holden, N. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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On the measurement of /sup 107/Ag//sup 109/Ag ratios in meteorites

Description: The detection of stable Ag isotopes in meteorites at the ppB level was attempted in an AMS experiment using the Munich MP tandem accelerator in conjunction with a time-of-flight detection system. The sensitivity of detecting Ag at this level was established by observing a counting rate of 17 ions of /sup 107/Ag per sec from a Au sample, which had been spiked with the radioisotope /sup 105/Ag (T/sub 1/2/ = 41 d) at a concentration of 1.0 ppB. A blank Ta sample gave no /sup 105/Ag counts in 13 mi… more
Date: January 1, 1986
Creator: Kutschera, W.; Faestermann, T.; Gillitzer, A. & Fortuna, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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(The determination of sup 222 Rn flux from soils based on sup 210 Pb and sup 226 Ra disequilibrium)

Description: The emanating fraction of radon in soils from the southern part of the United States is about 40% greater than in those from the northern part. The mean {sup 226}Ra activity in the southern soils is also slightly higher and as a consequence the {sup 222}Rn flux derived from the top 50 cm. is greater in the southern samples. We tentatively attribute these observations to the greater degree of weathering associated with the pre-glacial age of the parent material of many of the southern soils. The… more
Date: January 1, 1991
Creator: Turekian, K. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental level-structure determination in odd-odd actinide nuclei

Description: The status of experimental determination of level structure in odd-odd actinide nuclei is reviewed. A technique for modeling quasiparticle excitation energies and rotational parameters in odd-odd deformed nuclei is applied to actinide species where new experimental data have been obtained by use of neutron-capture gamma-ray spectroscopy. The input parameters required for the calculation are derived from empirical data on single-particle excitations in neighboring odd-mass nuclei. Calculated con… more
Date: April 4, 1985
Creator: Hoff, R.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Tritium operating safety seminar, Los Alamos, New Mexico, July 30, 1975

Description: A seminar for the exchange of information on tritium operating and safety problems was held at the Los Alamos Scientific Laboratory. The topics discussed are: (1) material use (tubing, lubricants, valves, seals, etc.); (2) hardware selection (valves, fittings, pumps, etc.); (3) biological effects; (4) high pressure; (5) operating procedures (high pressure tritium experiment at LLL); (6) incidents; and (7) emergency planning. (TFD)
Date: March 1, 1976
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Bromine-80m-labeled estrogens: Auger-electron emitting, estrogen receptor-directed ligands with potential for therapy of estrogen receptor positive cancers

Description: A triphenylbromoethylene, 1,1-bis(p-hydroxyphenyl)-2-bromo-2-phenylethylene, Br-BHPE, and a bromosteroidal estrogen, 17..cap alpha..- bromovinylestradiol, BrVE/sub 2/, were labeled with the Auger electron emitting nuclide bromine-80m, prepared by the (p,n) reaction with /sup 80/Se. To assess their potential as estrogen receptor (ER) directed therapeutic substrates the bromine-80m labeled estrogens were injected into immature female rats and the tissue distribution studied at 0.5 and 2 hours. Bo… more
Date: January 1, 1988
Creator: DeSombre, E. R.; Mease, R. C.; Hughes, A.; Harper, P. V.; DeJesus, O. T. & Friedman, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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