DOCSLIB.ORG

I, Bichard Lewis Woodward, Was Horn in Kansas City

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
I, Bichard Lewis Woodward, Was Horn in Kansas City AUTOBIOGRAPHT I, Bichard Lewis Woodward, was horn in Kansas City, Missouri, December 11, 1913 - My elementary and secondary school education was in the public schools of Kansas City and St . Louis, Missouri. In June, 1935. I received the degree Bachelor of Science in Civil Engineering from Washington University. I received the degree Master of Science from Harvard University in June, 1948. Since 1937 I have been an officer of tie United States Public Health Service . Under the auspices of this organisation, I have studied in the Department of Physics at the Ohio State University since June, 1949- - 42 - ACKNOWLEDGMENTS I wish to acknowledge the assistance of my adviser Prof M. L. Pool, of my coworker Mr. S . C. Fultz, of our chemist Mr. James McGlotten, and of Mr. Claude McWhlrt and other members of the staff of the Physics Department shops. - hi - BLBLIOGEAPHT 1. J. H. Buck, Fhys. Rev., 59, 1025 (1938) 2. A. Mukerji. P. Preiswerk, Felv . Phys. Acta, 23, 516 (1950) 3* G • T. Seahorg, I. Perlman, Rev. Mod. Phys., 20, 585 (1998) 9-. G. E. Valley, R. 1. McCreary, Phys. Rev., 5 6, 863 (1939) 5 . S. Sag&ne, S . Kojina, G. Miyamoto, Fhys. Math. Soc . Japan, Proc., 21, 728 (1939) 6 . E. C. Barker, Plutonium Proj . Report Mon. P-269, 8 (199-7) 7. S . E. Haynes, Phys. Rev., 79, 9-23 (1998) 8 . I*. M. Langer, R. D. Moffat, Ihys . Rev., 80, 6 51 (1950) 9. A. C. Helmholz, Phys. Rev., 60, 9-15 (1991) 10. J. M. Cork, L. N. Hadley, Jr., C. V. Kent, Phys. Rev., 61, 388(A), (1942) 11. L. Lloyd, Masters Thesis, 0 .S .U. (1951) 12. K . Metropolis, G. Reitwiesner, U.S.A.B.C., RP-1Q80, March, 1950 13- W. B. Kann, Phys. Rev., 52, 905 (1937) 19. L. H. Ridenour, V. J. Henderson, Phys. Rev., 5 2, 889 (193?) 15. H. H. Eopkins, Jr., 3. B. Cunningham, Fhy s .Rev ., 7 3, I9c6 (1998) 16. E. Segre, A. C. Helmholz, Rev .Mod .Phys ., 21, 281 (1999) 17. M. E . Rose, G. H. Goertzel, C. L. Perry. U.S.A.B.C., ORJiL - 1023, June 25. 1951) 18. M. G. Mayer. Phys. Rev., 78, 16 (1950) 19. J. A. Hunter, Doctoral Dissertation, 0 .S.U. (1950) - 90 - Correction of this difficulty will probably require a slit system or a more efficient ion source . A higher accelerating voltage would also he helpful. Time was not available to complete the necessary revisions to the vacuum system which installation of the slit system requires. - 39 - The Isotopes of lead were resolved satisfactorily. Other elements tested included zinc, antimony, tin, arsenic, selenium, indium, aluminum and cadmium. Salts of several elements of interest,ihich have too hi£h melting points in the elemental form, were also tested. These were ruthenium chloride, molybdenum oxide and a complex fluo­ ride of niobium. None of these provided satisfactory ion beams, either because of decomposition of the salts before appreciable amounts were vaporized or because of fragmentation of the molecules in the electron beam used to ionize the molecules with attendant reduction in the amount of material deposited at any one mass number. Zinc was chosen as the first active element to work with. A number of tests were made on inactive material to determine opti­ mum oven temperature, electron voltage and filament temperature. Over-all efficiency of approximately 1/1500 was obtained under the best conditions, i.e*. one ion was collected for every 1500 atoms vaporized. Two attempts to separate the radioactive isotopes were failures. In both cases, although there was apparently good reso­ lution, the activities of Zn^ which are made abundantly by deu- teron bombardment of zinc were found on all parts of the receiving plate. Molecular contamination was suspected and this was con­ firmed by finding activity on the receiving plate even when no electron beam was used to ionize the molecules. Such an effect would not be detected using inactive materials. - 38 - APPENDIX A MASS SPECTROGRAPH FOR SEPARATING RADIOACTIVE ISOTOPES The mass spectrograph for separating radioactive isotopes described by Hunter (19) was found in 1951 to be giving poor reso­ lution. A fluorescent screen was devised to permit direct visual observation of the lines produced at the receiving plate and poor focusing was observed. Various adjustments made no appreciable improvement . It was found that the arm of the spectrograph had incorrect dimensions for satisfying the geometrical requirement for first- order focusing, i.e., that the source, the apex of the sector mag­ netic field and the receiving plate be in a straight line . It was also found that the pole pieces of the magnet did not remain parallel because of the unsymmetric arrangement of tie pole pieces with respect to the main body of the magnet. A new arm was designed which overcame these difficulties and this was built in the Physics Department shops. The power supply which provides the accelerating voltage for the ions and the current for the filaments in the ion source was rebuilt to eliminate some overloaded elements, to pro­ vide for more convenient operation and to improve the stability of the high voltage supply. The rebuilt instrument was tested on Inactive samples of a number of relatively low melting point metals with good results. - 37 - The relati-rely large cross section found for a (He^,2n) reaction suggests that a "diproton" may exist momentarily during bombardment with He^ . - 3 6 - Summary G a ^ decays %ritb a half life of 1 5 *2 2 +. 0.08 minutes to 250 day Zn6-5 by emission of a positron with a maximum energy of 2.2 mev (determined by aluminum absorption). K capture also occurs * No gamma ray is found. The $6 kev gamma ray presently assigned to this isotope results from decay of Ga?®. The assignment of a 48 minute half life to G a ^ is almost cer­ tainly in error. No such activity was found in numerous bombardments of enriched Znfi** with protons of 7 -5 a*td. 3 .^ 5 maximum energy. Buck (l), who reported this activity, used natural zinc and reported a threshold of 4.1 mev for production of the Isotope by proton bom­ bardment . A (p.He ) reaction is produced in Zn by 7.5 ®ev protons. The half life of G a ^ has been accurately determined to be 9.55 ±. 0.03 hours. / n The 93 kev gamma ray accompanying the decay of Gu 1 results from decay of an isomer of Zn^ with a half life of 0 .3 5 ± 0 .1 5 milli­ seconds . The 180 kev and 297 kev gamma rays are in case side and lead directly to the ground state of Zn * . The 93 kev gamma ray is probably magnetic quadrupole radiation and the spin of the isomeric state is probably 9/2 . A decay scheme for G a ^ is proposed. He^ bombardments of copper produced the following reactions: (He^t He**), (He^.n) and either (He^.gaassa) or (He^,2n) or both. Relative cross sections for the various reactions have been measured. - 35 - particle entered into formation of a compound nucleus, a probable reaction would be the ejection of a neutron. This would appear to be a (He^,2n) reaction. Bombardment of enriched Cu^-5 with He^ would be desirable to eliminate the possible interference of a cap­ ture reaction on Cu63. - Jit - 15 minute positrons could not be determined accurately but they were relatively energetic. It is reasonable to ascribe this activity to GeA-* produced by a (He^,n) reaction on Cu®-^ . The 3.26 day activity is due to Ga®7 produced by a (He-^.n) reaction on Cu®^ . The reaction by which Ga®® was produced could be either Cu®-^ (He-^, gamma) or Cu®-* (He^,2n) . The fact that Ga®® was apparently not produced in any measureable amount tends to favor the latter reaction as the more likely. However the relatively large cross section for this reaction computed on the assumption of only the (He-^,2n) reaction occurring indicates that both reactions may take p l a c e . The relative cross sections for the production of the vari­ ous activities are as follows: Relative Product Hu c I c u m Cross Section Ga®7 9 Ga6 6 6 Ga®5 1 Cu6if 1 Cu6 2 1 A possible explanation for the apparently large cross sec­ tion for the (He^f2n) reaction postulates the existence of a "diproton" which could be formed as a result of polarization of the He^ ion in the coulomb field of the target nucleus. If such a - 33 - 1 0 0 0 0 - I 0 GU0 _ Short Act ■ ^ : 1 0 0 0 - t ooo- S ? A 1 0 0 - Minutes After Bombardrent Activity - 13 Arbitrary i n U cr i o _ 4 0 80 1 2 0 160 Hours after bombardment Fig* XVI - Cu + He3 Deca* Cur^e - 32 — level with the Mine oscillator quantum nuater at the ground state would have the same parity . Thus the most likely spin assignment for the isomeric state of Zn^? is 9/2 . Cu + He^ Bon>>^T-A^»Tit.a r Copper was bombarded with He-^ of 16 mev maximum energy. Since He^ has not previously been used as a bombarding particle in cyclotrons, the bombardment served the dual purpose of determining the nuclear reactions induced by He^ and of assisting in making the proper mass assignment to G a ^ and Ga^->. Three samples were bombarded. All three followed similar decays. The activities produced had half lives of 10 minutes, 15 minutes, 1.9 hours, 9*5 hours, 12.9 hours and 3 *2 6 days (Figure XVI) .
Load more

Recommended publications
  • How Earth Got Its Moon Article
    FEATURE How Earth Got its MOON Standard formation tale may need a rewrite By Thomas Sumner he moon’s origin story does not add up. Most “Multiple impacts just make more sense,” says planetary scientists think that the moon formed in the earli- scientist Raluca Rufu of the Weizmann Institute of Science in est days of the solar system, around 4.5 billion years Rehovot, Israel. “You don’t need this one special impactor to Tago, when a Mars-sized protoplanet called Theia form the moon.” whacked into the young Earth. The collision sent But Theia shouldn’t be left on the cutting room floor just debris from both worlds hurling into orbit, where the rubble yet. Earth and Theia were built largely from the same kind of eventually mingled and combined to form the moon. material, new research suggests, and so had similar composi- If that happened, scientists expect that Theia’s contribution tions. There is no sign of “other” material on the moon, this would give the moon a different composition from Earth’s. perspective holds, because nothing about Theia was different. Yet studies of lunar rocks show that Earth and its moon are “I’m absolutely on the fence between these two opposing compositionally identical. That fact throws a wrench into the ideas,” says UCLA cosmochemist Edward Young. Determining planet-on-planet impact narrative. which story is correct is going to take more research. But the Researchers have been exploring other scenarios. Maybe answer will offer profound insights into the evolution of the the Theia impact never happened (there’s no direct evidence early solar system, Young says.
    [Show full text]
  • Optimization Studies of the CERN-ISOLDE Neutron Converter and Fission Target System
    Optimization Studies of the CERN-ISOLDE neutron converter and fission target system Raul Luís1, José G. Marques, Thierry Stora, Pedro Vaz, Luca Zanini 1ITN – Estrada Nacional 10, 2686-953, Sacavém, Portugal 2CERN – CH-1211, Genève 23, Switzerland 3PSI – 5232 Villigen, Switzerland E-mail: [email protected] Abstract. The ISOLDE facility at CERN has been one of the leading isotope separator on-line (ISOL) facilities worldwide since it became operative in 1967. More than 1000 isotopes are available at ISOLDE, produced after the bombardment of various primary targets with a pulsed proton beam of energy 1.4 GeV and an average intensity of 2 μA. A tungsten solid neutron converter has been used for ten years to produce neutron-rich fission fragments in UCx targets. In this work, the Monte Carlo code FLUKA and the cross section codes TALYS and ABRABLA were used to study the current layout of the neutron converter and fission target system of the ISOLDE facility. An optimized target system layout is proposed, which maximizes the production of neutron-rich isotopes and reduces the contamination by undesired proton-rich isobars. The studies here reported can already be applied to ISOLDE and will be of special relevance for the future facilities HIE-ISOLDE and EURISOL. 1. Introduction One of the most efficient ways to study nuclei far from stability is the Isotope Separation On-Line (ISOL) method, in which a beam of high-energy hadrons hits a thick target, producing a great variety of radioactive products through different processes like fission, spallation and fragmentation [1]. The resulting nuclides can be studied after they are extracted from the target, ionized and mass separated.
    [Show full text]
  • Concurrent Reduction and Distillation; an Improved Technique for the Recovery and Chemical Refinement of the Isotopes of Cadmium and Zinc*
    If I CONCURRENT REDUCTION AND DISTILLATION; AN IMPROVED TECHNIQUE FOR THE RECOVERY AND CHEMICAL REFINEMENT OF THE ISOTOPES OF CADMIUM AND ZINC* H. H. Cardill L. E. McBride LOHF-821046—2 E. W. McDaniel DE83 001931 Operations Division Oak Ridge National Laboratory Oak Ridge, Tennessee 3 7830 .DISCLAIMER • s prepared es an accouni oi WOTk sconsQ'ed by an agency of itie United Slates Cover r "iiit?3 Stilt 65 Gov(?fnft»gn ^ ri(jt ^nv aQcncy Tllf GO* ^or rlny O^ tt^^ir ^rnployut^. TigV MASTER lostifl. ion, apod'aiuj pioiJut;. <y vned nghtv Reference hcein xc any v>t^-'T*t. ^ Dv ^.r^de narno, tf^Oernafk^ mir'ij'iJClureT. or otrierw «d <Jo*^ •nenaalion. or liivONng bv 'Vhe United _^_ . vs and opinions of authors enp'«i«] herein do noi IOM t' irip UnitK* Stales Govefnrneni c a^v agency For presentation at the 11th World Conference of the International Nuclear Target Development Society, October 6-8, 1982, Seattle, Washington. By acceptance of this article, the publisher or recipient acknowledge* the U.S. Govarnment's right to retain a nonaxclusiva, royalty-frtta license in and to any copyright covering tha article. NOTICE P0T09_0£-Jfns,J^SPQRT_JfgE_Il,LESIBLE. I has been reproauce.1 from the best available aopy to pensit the broadest possible avail- ability* *Research sponsored by the Office of Basic Energy Science, U.S. Department of Energy under contract W-7405-eng-26 with the Union Carbide Co rpcration,, DISTRIBUTION OF THIS DOCUMEHT 18 UNLIMITED ' CONCURRENT REDUCTION AND DISTILLATION - AY. IMPROVED TECHNIQUE FOR THE RECOVERY AND CHEMICAL REFINEMENT OF THE ISOTOPES OF CADMIUM AND ZINC H.
    [Show full text]
  • Beta Decay of Neutron-Rich Isotopes of Zinc and Gallium
    University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 5-2015 Beta decay of neutron-rich isotopes of zinc and gallium Mohammad Faleh M. Al-Shudifat University of Tennessee - Knoxville, [email protected] Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Part of the Nuclear Commons Recommended Citation Al-Shudifat, Mohammad Faleh M., "Beta decay of neutron-rich isotopes of zinc and gallium. " PhD diss., University of Tennessee, 2015. https://trace.tennessee.edu/utk_graddiss/3288 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Mohammad Faleh M. Al-Shudifat entitled "Beta decay of neutron-rich isotopes of zinc and gallium." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Doctor of Philosophy, with a major in Physics. Robert Grzywacz, Major Professor We have read this dissertation and recommend its acceptance: Soren Sorensen, Thomas Papenbrock, Jason P. Hayward Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) Beta decay of neutron-rich isotopes of zinc and gallium A Dissertation Presented for the Doctor of Philosophy Degree The University of Tennessee, Knoxville Mohammad Faleh M.
    [Show full text]
  • Evolution of Nuclear Structure in Neutron-Rich Odd-Zn Isotopes and Isomers ∗ C
    Physics Letters B 771 (2017) 385–391 Contents lists available at ScienceDirect Physics Letters B www.elsevier.com/locate/physletb Evolution of nuclear structure in neutron-rich odd-Zn isotopes and isomers ∗ C. Wraith a, X.F. Yang b, , L. Xie c, C. Babcock a, J. Bieron´ d, J. Billowes c, M.L. Bissell b,c, K. Blaum e, B. Cheal a, L. Filippin f, R.F. Garcia Ruiz b,c, W. Gins b, L.K. Grob g, G. Gaigalas h, M. Godefroid f, C. Gorges i, H. Heylen b, M. Honma j, P. Jönsson k, S. Kaufmann g, M. Kowalska l, J. Krämer i, S. Malbrunot-Ettenauer l, R. Neugart e,g, G. Neyens b, W. Nörtershäuser g,i, F. Nowacki m, T. Otsuka n, J. Papuga b, R. Sánchez o, Y. Tsunoda p, D.T. Yordanov q a Oliver Lodge Laboratory, Oxford Street, University of Liverpool, Liverpool, L69 7ZE, United Kingdom b KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium c School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom d Instytut Fizyki imienia Mariana Smoluchowskiego, Uniwersytet Jagiello´nski, ul. prof. Stanisława Łojasiewicza 11, Kraków, Poland e Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany f Chimie Quantique et Photophysique, Université Libre de Bruxelles, B-1050 Brussels, Belgium g Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany h Institute of Theoretical Physics and Astronomy, Vilnius University, Sauletekio˙ av. 3, LT-10222 Vilnius, Lithuania i Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany j Center for Mathematical Sciences, University of Aizu, Tsuruga,
    [Show full text]
  • Stable Isotope Separation in Calutrons
    Printed ill tho llnitzd Statss ot 4mcm 4vailsble frurii Nations' Technical Information Service U S :3ep?rtmelli uf Commerce 5285 Port 4oyal Cosd Spririizflald Viryinis 22161 NTlS ptwiodes P~III~~Copy ,498, Microfiche P,C1 I his rcpoti \*!is prspxed as an account of >,dSi-k sponsored by a3 agsncy of the United Sraies Governr;,ent. Neither thc !J nited Skiics i<n.~cti $IK~: nor any agency th2reof. no? any of thzir employoes, (ciakc?.Aijy ivarranty, express or irripiled, or assunias any legal liability or responsibility for ihe accuracy. compleienass, or usefulness of any inforriraiton. ;p ius, product, or process disclosed, or represents that its usewould not infr privately o-v?d ilghts Rcferencc herein to ai-y specific commercial product, process, or service by trade nziile, Zi'adei*lark, manufacturer, or otherwise, does not necsssarily constitute or imply its enduisemcat, recorn,n faVOiii-,g by ille United States(;ovc;riiiie!ii 01- any Zgency thereof Th opinions of auiihols cxp:essed here:!: d~ ~iui neccssarily statc or refisc?!host of the United Sta?ezGovernmer:?or any ngcncy therccf. ____ ___________... ..... .____ ORNL/TM-10356 OPERATIONS DIVISION STABLE ISOTOPE SEPARATION IN CALUTRONS: FORTY YEARS OF PRODUCTION AND DISTRIBUTION W. A. Bell J. G. Tracy Date Published: November 1987 Prepared by the OAK RIDGE NATIONAL LABORATORY Oak Ridge, Tennessee 37831 operated by MARTIN MARIETTA ENERGY SYSTEMS, INC. for the U.S. DEPARTMENT OF ENERGY under Contract No. DE-AC05-840R21400 iti CONTENTS Page ACKNOWLEDGMENTS ................................................. iv I. INTRODUCTION .............................................. 1 11. PROGRAM EVOLUTION ......................................... 1 111. RESEARCH AND DEVELOPMENT .................................. 5 IV. CHEMISTRY ................................................. 8 V.
    [Show full text]
  • Zinc Isotope Composition of the Earth and Its Behaviour During Planetary Accretion Paolo Sossi, Oliver Nebel, Hugh St.C
    Zinc isotope composition of the Earth and its behaviour during planetary accretion Paolo Sossi, Oliver Nebel, Hugh St.C. O’Neill, Frédéric Moynier To cite this version: Paolo Sossi, Oliver Nebel, Hugh St.C. O’Neill, Frédéric Moynier. Zinc isotope composition of the Earth and its behaviour during planetary accretion. Chemical Geology, Elsevier, 2018, 477, pp.73-84. 10.1016/j.chemgeo.2017.12.006. insu-02917173 HAL Id: insu-02917173 https://hal-insu.archives-ouvertes.fr/insu-02917173 Submitted on 19 Aug 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Accepted Manuscript Zinc isotope composition of the Earth and its behaviour during planetary accretion Paolo A. Sossi, Oliver Nebel, Hugh St.C. O'Neill, Frédéric Moynier PII: S0009-2541(17)30678-2 DOI: https://doi.org/10.1016/j.chemgeo.2017.12.006 Reference: CHEMGE 18577 To appear in: Chemical Geology Received date: 22 September 2017 Revised date: 6 December 2017 Accepted date: 8 December 2017 Please cite this article as: Paolo A. Sossi, Oliver Nebel, Hugh St.C. O'Neill, Frédéric Moynier , Zinc isotope composition of the Earth and its behaviour during planetary accretion.
    [Show full text]
  • RCED-91-90 Nuclear Nonproliferation: Controls Over the Commercial
    ~~ ---- Mm t, 1!I!) 1 NUCLEAR 1 NONPROLIFERATION Controls Over the Commercial Sale and Export of Tritium Can Be Improved I I 143689 --.- .-..__.--- --_.--__--._--.-- Resources, Cannmnity, and Economic Development Division B-242882 March 25,199l The Honorable John D. Dingell Chairman, Subcommittee on Oversight and Investigations Committee on Energy and Commerce House of Representatives The Honorable Edward J. Markey House of Representatives This report responds to your February 8 and March 5, 1990, requests that we examine the adequacy of existing controls by the Department of Energy (DOE) and the Nuclear Regulatory Commission (NRC) on the com- mercial sales and exports of tritium, a radioactive isotope of hydrogen that can be used to enhance the explosive power of nuclear weapons. You both expressed concern about reported losses of radioactive tritium gas from DOE’S Oak Ridge National Laboratory (ORNL).’ Subsequently, we met with your offices and agreed to examine the fol- lowing issues: 9 The promptness and adequacy of DOE’S and NRC’S investigations into the major tritium discrepancies which occurred in 1988 at ORNL, including any investigations into the possibility that the tritium might have been stolen or diverted.2 . The weaknesses in the management and operation of the DOE isotope sales program that led to reported tritium discrepancies and the weak- nesses in existing material controls over and accounting for tritium. Whether DOE and NRC should reevaluate their positions on the level of controls required for possessing and shipping tritium or the reporting requirements imposed on tritium licensees, including the feasibility and desirability of having NRC include a determination of tritium end use in its inspections of licensees to alleviate concerns that tritium might not be used as intended.
    [Show full text]
  • Effects of the Biological Specificity of Zinc on the Distribution of Fallout Zinc-65 in the Lagoon of Rongelap
    410435 EFFECTS OF THE BIOLOGI~ SPECIFICITY OF ZINC ON THE DISTRIBUTION OF ZINC-65 IN THE FISH FAUNA OF A CORAL ATOLL LAGOON by TIMOTHY JOYNER A thesis submitted in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOP= UNIVERSI~ OF WASHINGTON 1962 EFFECTS OF THE BIOU3GIUL SPECIFICI~ OF ZINC ON THE DISTRIBUTION OF ZINC-65 IN THE FISH FAUNA OF A CORAL ATOLL LAGOON by TIMOTHY JOYNER A thesis submitted in partial fulfillment of the requirements for the degree of DOCTOR OF PHIULSOPHY UNIVERSITY OF WASHINGTON 1962 Approved by Department in which College of Fisheries degree is granted Date August 16, 1962 Abstract Some effects of the biological specificity of zinc on the distribution of fallout zinc-65 in the lagoon of Rongelap Atoll were studied by means of radiometric and chemical analy- ses of fish tissues. Stable zinc, after chromatographic sepa- ration from the first series transition elements, was determined by a colorirnetric method using dithizone. Zinc-65 was determined by gamma spectrometry. Fallout radiozi.nc apparently became associated with a particulate phase in the water of the lagoon. Biological uptake and retention in the ecological systems of the lagoon prevented its flushing out of the atoll in the exchange of water between the lagoon and the ocean. ‘l”heingestion, by heterotrophs, of particulate matter in the water favored the concentration of radiozinc in car- nivorous fish. Eyes were shown to be useful and convenient organs for determining the relative accumulation of radiozinc by different fish. Table of Contents 1. Introduction ......................................... 1 2. Historical Red=< ..................................
    [Show full text]
  • Total Я-Decay Energies and Atomic Masses Regions Far
    Z -> => 3 Q i I 2- TOTAL ß-DECAY ENERGIES AND ATOMIC MASSES REGIONS FAR FROM ß-STABILITY On-line isotope separator investigations in the mass regions A = 75 87, 120-135 and 222-229 KJELL ALEKLETT DEPARTMENT OF PHYSICS 1977 •i=M ERRATA Paper Page Line Stands Read Sum. 19 1 1335 keV 1336 keV 32 85Br 2.870 2.871 32 76Rb _+ 0.12 + 0.57 33 131Sn -77.43 -77.42 33 130Sb + 0.08 ... + 0.08 _+ 0.10 ... + 0.10 33 131Sb 3.18+0.09 -82.02+0.09 3.19_+0.07 -82.01+0.07 33 134Sb +u.21 ±0.24 33 121Cs +0.37 ±0.49 35 In ... 0.16 ... 0.17 35 Sn.Sb.Te ... 0.41 ... 0.36 43 Sn.Sb.Te ... 0.44 ... 0.40 ... 0,49 ... 0.36 I 1 13 reliabily reliability 12 ref. 10 £7(1973)6 £7(1973)296 11 4 Fig 2 1836 (a level) 1832 6 14 f.botton level scheme decay scheme 13 14 18.5 isomer 18.5 s isomer 79,80,81 15 6 Ge 79>80Ge 82,83 16 7 Ge 81"83Ge III 13 10 ±0.08 ±0.10 V 139 Table 13 +0.31 ±0.49 121Cs On-line isotope separator investigations in the mass regions Ä = 75-87,120-135, and 222-229 by KJELL ALEKLETT AKADEMISK AVHANDLING för filosofie doktorsexamen i fysik (examinátor bitr prof Göran Andersson) som enligt beslut av fysiska avdelningen vid matematisk/teknisk fysiska sektionsgruppen vid Chalmers tekniska högskola och Göteborgs universitet kommer att offentligen försvaras fredagen den 11 mars 1977 kl 10.15 i rum 6306 Fysiska institutionen! Chalmers tekniska högskola.
    [Show full text]
  • Subcommittee on Nuclear and Radiochemistry Committee on Chemical Sciences Assembly of Mathematical and Physical Sciences National Research Council
    SEPARATED ISOTOPES: cnrp-Rono'*-* c-nmn VITAL TOOLS TOR SCIENCE AND MEDICINE C0LF 820233 — Summ. DE33 011646 Subcommittee on Nuclear and Radiochemistry Committee on Chemical Sciences Assembly of Mathematical and Physical Sciences National Research Council DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsi- bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Refer- ence herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom- mendation, or favoring by the United States Governmenl or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. NATIONAL ACADEMY PRESS Washington, D.C. 1982 \P DISTR1BUT10II Of THIS DOCUMENT IS UNLIMITED NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the Councils of the National Academy of Sciences, the Nationcil Academy of Engineering, and the Institute of Medicine. The members of the Committee responsible for the report were chosen for their special competences and with regard for appropriate balance. This report has been reviewed by a group other than the authors according to procedures approved by a Report Review Committee consisting of members of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine.
    [Show full text]
  • Arxiv:1012.2027V1 [Nucl-Ex] 9 Dec 2010
    Discovery of Zinc, Selenium, Bromine, and Neodymium Isotopes J. L. Gross, J. Claes, J. Kathawa, M. Thoennessen∗ National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA Abstract Currently, thirty-two zinc, thirty-two selenium, twenty-nine bromine and thirty-one neodymium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented. arXiv:1012.2027v1 [nucl-ex] 9 Dec 2010 ∗Corresponding author. Email address: [email protected] (M. Thoennessen) Preprint submitted to Atomic Data and Nuclear Data Tables November 14, 2018 Contents 1. Introduction . 4 2. Discovery of 54−85Zn ................................................................................... 5 2.1. 54Zn ............................................................................................ 5 2.2. 55;56Zn .......................................................................................... 7 2.3. 57Zn ............................................................................................ 7 2.4. 58Zn ............................................................................................ 7 2.5. 59Zn ............................................................................................ 7 2.6. 60;61Zn .......................................................................................... 7 2.7. 62Zn ...........................................................................................
    [Show full text]