Search Results

Advanced search parameters have been applied.

The Sequential Analysis of Ten Nuclides Occurring in Long Range Fallout Debris

Description: Abstract : Methods for the chemical separation of strontium, barium, cesium, cerium, yttrium, zirconium, niobium, and tungsten from complex matrices are described. Procedures for the radiometric determination of the longer-lived isotopes of these elements are outlined. Inert carriers are added and the sample is dissolved by fusion with sodium carbonate. The melt is leached first with water and then with hydrochloric acid. The elements are recovered from these fractions by a series of wet chemical and ion exchange procedures, and gravimetric and radiometric determinations performed.
Date: March 4, 1959
Creator: Welford, George A.; Collins, William R., Jr.; Sutton, Doris C. & Morse, Robert S.
Partner: UNT Libraries Government Documents Department

Evaluation and compilation of fission product yields 1993

Description: This document is the latest in a series of compilations of fission yield data. Fission yield measurements reported in the open literature and calculated charge distributions have been used to produce a recommended set of yields for the fission products. The original data with reference sources, and the recommended yields axe presented in tabular form. These include many nuclides which fission by neutrons at several energies. These energies include thermal energies (T), fission spectrum energies (F), 14 meV High Energy (H or HE), and spontaneous fission (S), in six sets of ten each. Set A includes U235T, U235F, U235HE, U238F, U238HE, Pu239T, Pu239F, Pu241T, U233T, Th232F. Set B includes U233F, U233HE, U236F, Pu239H, Pu240F, Pu241F, Pu242F, Th232H, Np237F, Cf252S. Set C includes U234F, U237F, Pu240H, U234HE, U236HE, Pu238F, Am241F, Am243F, Np238F, Cm242F. Set D includes Th227T, Th229T, Pa231F, Am241T, Am241H, Am242MT, Cm245T, Cf249T, Cf251T, Es254T. Set E includes Cf250S, Cm244S, Cm248S, Es253S, Fm254S, Fm255T, Fm256S, Np237H, U232T, U238S. Set F includes Cm243T, Cm246S, Cm243F, Cm244F, Cm246F, Cm248F, Pu242H, Np237T, Pu240T, and Pu242T to complete fission product yield evaluations for 60 fissioning systems in all. This report also serves as the primary documentation for the second evaluation of yields in ENDF/B-VI released in 1993.
Date: December 31, 1995
Creator: England, T. R. & Rider, B. F.
Partner: UNT Libraries Government Documents Department

Isotope separations section progress report for quarter ending December 31, 1975

Description: Isotopic separations of Hg, Tl, Sn, and Yb were continued throughout the quarter, using the twenty-four 180/sup 0/ electromagnetic separators. Results of the separations are reported. A study of the characteristics of the 255/sup 0/ separators has been made using SnS, SnCl/sub 4/, PbCl/sub 2/, CCl/sub 4/, and BCl/sub 3/ as charge materials. Developmental efforts are continuing to enhance the capability of the 180/sup 0/ sector isotope separator to prepare highly enriched isotopic targets directly for all isotopes without the need to use preenriched charge materials. The following elements were in chemical processing during the quarter: Hg, Te, Tl, Sn, and Yb. The isotopic materials that were released or made available to Sales during the quarter are shown in tabular form. In addition to the eight new lots of isotopes released to Sales, 15 loan-return samples were processed and returned to inventory. (TFD)
Date: April 1, 1976
Creator: Newman, E.
Partner: UNT Libraries Government Documents Department

Safety analysis report for packaging: neutron shipping cask, model 4T

Description: This Safety Analysis Report for Packaging demonstrates that the neutron shipping cask can safely transport, in solid or powder form, all isotopes of uranium, plutonium, americium, curium, berkelium, californium, einsteinium, and fermium. The cask and its contents are described. It also evaluates transport conditions, structural parameters (e.g., load resistance, pressure and impact effects, lifting and tiedown devices), and shielding. Finally, it discusses compliance with Chapter 0529 of the Energy Research and Development Administration Manual, Safety Standards for the Packaging of Fissile and Other Radioactive Materials.
Date: March 4, 1977
Creator: Peterson, R. T.
Partner: UNT Libraries Government Documents Department

Stable isotope sales: Mound Laboratory customer and shipment summaries, FY 1976 and FY 1976A

Description: A listing is given of Mound Laboratory's sales of stable isotopes of noble gases, carbon, oxygen, nitrogen, chlorine, and sulfur for fiscal years 1976 and 1976A (the period July 1, 1975 through September 30, 1976). Purchasers are listed alphabetically and are divided into domestic and foreign groups. A cross-reference index by location is included for domestic customers. Cross-reference listings by isotope purchased are included for all customers.
Date: June 6, 1977
Creator: Ruwe, A. H., Jr.
Partner: UNT Libraries Government Documents Department

Methods of Analysis of Fission Products in the Experimental Biology Section

Description: From abstract: "This report describes methods used for radiochemical analysis of fission products most used in the Experimental Biology Section. The report includes methods of analysis of Sr89, Ba140-La140, Zr95-Cb95, Ce144-Pr144, and Y91 by standard chemical procedures. In addition, a method of analysis by use of an absorption curve is described in some detail for Zr95-Cb95 mixtures. The absorption curve method makes possible rapid determination of percentage composition of a mixture of isotopes with a minimum of chemical manipulation by utilizing the differences in absorption characteristics of the emitted rays."
Date: September 26, 1946
Creator: Tompkins, Paul C.; Broido, Abraham; Wish, Leon & Zinn, Walter H. (Walter Henry), 1906-2000
Partner: UNT Libraries Government Documents Department

Nuclear structure from radioactive decay. Annual progress report

Description: This report discusses nuclear structure from radioactive decay of the following: Neutron-Deficient Iridium Isotopes; Neutron-Deficient Platinum Isotopes; Neutron-Deficient Gold Isotopes; Neutron-Deficient Mercury Isotopes; Neutron-Deficient Thallium Isotopes; Neutron-Deficient Lead Isotopes; Neutron-Deficient Samarium Isotopes; Neutron-Deficient Promethium Isotopes; Neutron-Deficient Neodymium Isotopes; and Neutron-Deficient Praseodymium Isotopes. Also discussed are Nuclear Systematics and Models.
Date: September 30, 1991
Creator: Wood, J. L.
Partner: UNT Libraries Government Documents Department

Nuclear structure from radioactive decay

Description: This report discusses nuclear structure from radioactive decay of the following: Neutron-Deficient Iridium Isotopes; Neutron-Deficient Platinum Isotopes; Neutron-Deficient Gold Isotopes; Neutron-Deficient Mercury Isotopes; Neutron-Deficient Thallium Isotopes; Neutron-Deficient Lead Isotopes; Neutron-Deficient Samarium Isotopes; Neutron-Deficient Promethium Isotopes; Neutron-Deficient Neodymium Isotopes; and Neutron-Deficient Praseodymium Isotopes. Also discussed are Nuclear Systematics and Models.
Date: September 30, 1991
Creator: Wood, J.L.
Partner: UNT Libraries Government Documents Department

The medical applications of radioactive tracers

Description: This report provides a broad yet in depth overview of the use of radioactive materials as tracers in medicine and biology for the period of 1935--1947. Particular attention is paid to is of radio-sodium, radio-iodine, radio-iron, radio-phosphorus, radio-strontium, and fission products. The main thrust of this paper is human rather than animal work and focuses in work that has been published.
Date: December 31, 1947
Creator: Hamilton, J. G.
Partner: UNT Libraries Government Documents Department

Nuclear Structure From Radioactive Decay

Description: This report discusses the nuclear structure of the following isotopes as a result of radioactive decays: neutron-deficient iridium isotopes; neutron-deficient platinum isotopes; neutron-deficient gold isotopes; neutron-deficient mercury isotopes; neutron-deficient thallium isotopes; neutron-deficient lead isotopes; neutron-deficient promethium isotopes; and neutron-deficient samarium isotopes.
Date: September 30, 1990
Creator: Wood, J. L.
Partner: UNT Libraries Government Documents Department

Production of Xe¹³¹, Xe¹³⁵, Kr⁸⁵m and Kr⁸⁵ From Plated-Out U²³⁵ in the MTR Core

Description: This report discusses details of the release of Xe¹³¹, Xe¹³⁵, Kr⁸⁵m and Kr⁸⁵ into the process water system of the MTR along with the development of high process water radioactivity. It is suggested that this release followed the fissioning of U²³⁵. Equations that produce the rate of release of fission products is given and approximate rate of release is represented in a graph.
Date: January 14, 1955
Creator: Grimaud, Adrian V.
Partner: UNT Libraries Government Documents Department

Nuclear Data Review and Compilation for ATW Systems

Description: In order to solve the problem of nuclear power waste transmutation in neutron flux it is necessary to know the characteristics of neutron interaction for a great number of nuclei in the energy range from 0 to hundreds of MeV. The authors distinguished the most important aspect of this problem that one of nuclear data for actinides, (from Th to Cm isotopes) They have given the overview of evaluations of characteristic of interaction between neutrons and these nuclei leading to transformation from target-nucleus to neighboring actinide-nucleus or fission fragments in the limited energy range from 0 to 14 MeV. The review was carried out by comparison of mentioned characteristics from the modern versions of ENDL-82, JENDL-3, ENDF/B-6 and BROND-2 neutron evaluated data among themselves and with recommended data of previous publications and, in some cases, with the measurement results. ENDL-82 and ENDF/B-6 versions were made in USA laboratories, JENDL-3 was made in the laboratories of Japan and BROND-2 version was made in the laboratories of former USSR. The comparison of nuclear data from various libraries was carried out by the most economic method permitting, nevertheless, fully judge of available uncertainties in the knowledge of competitive nuclear data which are important from the point of view of problem of transmutation in various energies neutron flux. The following characteristics were considered: (a) fission and capture cross-sections at thermal point (E{sub n}=0.0253 eV); (b) infinitely dilute resonance integrals of fission and capture designated by I{sub f} and I{sub {gamma}} (c) averaged on {sup 252}Cf spontaneous fission neutron spectrum cross-sections of fission, capture and the (n,2n) reactions; (d) cross-sections of fission and the (n,2n), (n,3n) reactions at the point En = 14 MeV; (e) fission and capture resonance integrals for a interval of sets with the increasing upper (E {sub max}) and lower (E …
Date: October 1, 1994
Creator: Guzhovskii, B.; Gorelov, V.; Il`in, V.; Farafontov, G. & Grebennikov, A.
Partner: UNT Libraries Government Documents Department

Selection of Actinide Chemical Analogues for WIPP Tests: Potential Nonradioactive Sorbing and Nonsorbing Tracers for Study of Ion Transport in the Environment

Description: Chemical characteristics of the actinides (Th, U, Np, Pu, Am) have been studied relative to nonradioactive chemical elements that have similar characteristics in an attempt to identify a group of actinide chemical analogues that are nonradioactive. In general, the chemistries of the actinides, especially U, Np, Pu, and Am, are very complex and attempts to identify a single chemical analogue for each oxidation state were not successful. However, the rationale for selecting a group of chemical analogues that would mimic the actinides as a group is provided. The categorization of possible chemical analogues (tracers) with similar chemical properties was based on the following criteria. Categorization was studied according.
Date: August 1, 1998
Creator: Spall, Dale & Villarreal, Robert
Partner: UNT Libraries Government Documents Department

The Reaction Al²⁷(p,3pn)Na²⁴

Description: Abstract: "The cross section for the reaction Al²⁷(p,3pn)Na²⁴ has been measured for proton energies between 30 and 350 Mev relative to the cross section for the reaction C12(p,3pn)C11, and the absolute magnitude determined by matching with data measured with a Faraday cup at 350 Mev and at 31.5 Mev."
Date: August 11, 1954
Creator: Stevenson, P. C.; Hicks, H. G. & Folger, R. L.
Partner: UNT Libraries Government Documents Department

General Report of Stable Isotope Separation

Description: Abstract: "The Calutron has been successfully employed to separate the stable isotopes of twenty-one elements. The standard Beta M-2 unit modified to handle charge materials of various temperature ranges has proven adequate for a majority of separations. The problem of K life has received considerable attention but is still to be solved. Other operational problems are similar in most respects to those of uranium. The E design has, of necessity, varied greatly from the "Beta Gloria" type. A desire to keep construction simple, yet adequate for efficient collection and readily adaptable for use with many elements, has dictated the trend in E design. Water cooling on the receiver pockets was necessary with many of the elements separated. The chemical purification of the separated samples, although following a general pattern, varies with the type of pockets used and the element collected."
Date: January 20, 1947
Creator: Ketler, W. R.; Chelius, L. G. & Keim, C. P.
Partner: UNT Libraries Government Documents Department

A Determination of the U-235 Content in Highly Impoverished Material

Description: Introduction: "The product of a special run made in XAX was submitted to the Assay Department for a determination of the residual content of the 235 isotope. The charge material on this run was impoverished, with a ratio of approximately 1:2,000. The sample was submitted in the form of purified T3O8."
Date: 1946
Creator: Cameron, A. E. & Hibbs, Roger F.
Partner: UNT Libraries Government Documents Department

Isotopes of Neptunium and Plutonium

Description: This report describes work done that originated in an effort to identify previously unknown isotopes of neptunium and plutonium and to characterize a few that were known for extension of the nuclear energy surface. The findings of this work results in two new light plutonium isotopes and one heavy neptunium isotope that were produced by bombardment of uranium with helium and deuteron ions from a 60-inch cyclotron and a 184-inch cyclotron. The chemical and experimental methods are described as well as the results of the bombardment work for each nuclide.
Date: December 1950
Creator: Orth, Donald Alfred
Partner: UNT Libraries Government Documents Department

The Isotopic Composition of Trace Quantities of Lead and Calcium

Description: The following report discusses development of new micro-chemical and micro-mas spectrometric techniques for handling trace quantities of lead. The first two sections of this report summarizes the development and trial application to mineral separates of a granite rock. The third section summarizes similar techniques developed for the determination of calcium, and gives the results of an application of the technique to the determination of the radioactive decay constants of K-40.
Date: 1951
Creator: Patterson, Claire
Partner: UNT Libraries Government Documents Department
Back to Top of Screen