The Environmental Behaviour of Polonium
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Exotic Nuclear Decay Discovered
Exotic nuclear decay discovered The discovery, nearly a century after Becquerel, ofa novel mode of radioactive decay is a surprise, but one that confirms a decay as the chief means by which heavy nuclei shed mass. THOSE who decorate their offices with wall observations now reported, there are particle exists within the nucleus it will then charts showing the isotopes, stable and roughly 1,000 million times as many escape, or the rate of the corresponding otherwise, of the elements are in for a-particles and 14C nuclei in the decay of disintegration process, is thus a function of trouble. As things are, these elaborate mRa, perhaps as vivid a proof as there the height of the potential barrier, its width diagrams usually show by means of a could be of the dominance of the familiar and of the total decrease of the potential colour scheme of some kind which radio mechanisms of decay. energy of the system once the disinte actively unstable nuclei decay by which The rarity of these events is also the gration has taken place. means. Decays in which the a- or explanation why this novel form of radio This calculation, first made in simple {J-particles (electrons) are emitted activity has not previously been found. So form by Gamow, has more recently been predominate, but the diagrams must also much can be told from the account by Rose much refined and accounts for the make room for other less common and Jones of their observations, which "Gamow factors" used by Rose and Jones processes - positron emission, internal entailed more than half a year of running as part of their reason for believing that conversion (of an electron in an inner shell) time with detectors arranged so as to their disintegration products are 14C and and even fission. -
T1-Kovler-Purification-Of-Phosphogypsum-Israel.Pdf
Prof. Konstantin Kovler is Head of the Department “Building Materials, Performance and Technology”, National Building Research Institute (NBRI), Faculty of Civil & Environmental Engineering, Technion - Israel Institute of Technology. His research focuses on recycling industrial by-products in construction, PURIFICATION OF PHOSPHOGYPSUM FROM high-performance cementitious materials, radioactivity of building materials, and radon mitigation. Fellow of RILEM, Editor of Materials & Structures, Cement & Concrete Composites. Chairs committees “Ecological Aspects of Construction”, “Radioactivity of Building Products,” Israeli Standards Institution. 226Ra AND HEAVY METALS FOR ITS FURTHER Director of Technion Recycling Initiative. UTILIZATION IN CONSTRUCTION: Eng. Boris Dashevsky is Research Fellow, the Department “Building Materials, Performance and TECHNOLOGICAL UTOPIA OR REALITY? Technology”, NBRI. His research interests are in technologies of manufacturing building materials using mechano-chemical activation, recycling industrial by-products (phosphogypsum, coal ash, copper slag, carbonate rock waste of dimension stone factories and quarries, construction and demolition waste – including asbestos-cement, acid tar, sulfur- and sulfonate-containing wastes) in construction. Konstantin Kovler1 , Boris Dashevsky1, David S. Kosson2 1National Building Research Institute – Prof. David S. Kosson is Cornelius Vanderbilt Professor of Engineering at Vanderbilt University, Nashville, Tennessee, US, where he has appointments as Professor of Civil and Environmental -
Membership Policy
Membership Policy The General Committee annually determines the categories of membership and charges that will apply from September each year. Membership of SBSC provides the following benefits: 1. Right to store a supported class at the club (subject to availability) and other classes subject to General Committee approval on a case-by-case basis. 2. Free entry into all club races covered by season sailing instructions. 3. Access to discounted use of the clubhouse for private functions. 4. Right to use club on-water assets for private use, with conditions. The following table sets out the current categories and charges that apply to the 2016-17 sailing year: Annual Category Benefit Exclusions/Conditions Subscription Individual $300 Full benefits Family $500 Full benefits Life No Charge Full benefits * Social – Storage, entry fees and use of on water $150/$250 Individual/family asset not included 3 month individual membership to cover $20 per Schools Teams Racing roster, no other club Teams Racing term rights apply other than access to YA insurance. Participants and members of other clubs are deemed to be members of SBSC for the duration of training whilst participating in Training No Charge club run events. No club rights apply other than the ability to leave boats on club premises for the duration of the event. Benefits of Corporate Membership are Corporate $1000 detailed in individual agreements. *Life membership is bestowed on an individual or a couple and does not extend to family of a life member. Where a life member has family members who wish to join the club they are required to purchase a separate membership package. -
Distribution Coefficients of Polonium Between 0.75 M HDEHP in Cyclo- Hexane and Aqueous Hydrochloric and Nitric Acids Guogang Jia* and Giancarlo Torri
18 The Open Inorganic Chemistry Journal, 2008, 2, 18-21 Distribution Coefficients of Polonium Between 0.75 M HDEHP in Cyclo- hexane and Aqueous Hydrochloric and Nitric Acids Guogang Jia* and Giancarlo Torri Agency for Environmental Protection and for Technical Services, Via V. Brancati 48, 00144 Roma, Italy Abstract: The distribution coefficients (D) of polonium between 0.75 M di(2-ethyhexyl)phosphoric acid (HDEHP) in cy- clohexane and aqueous hydrochloric and nitric acids have been studied. Results indicate that: (1) D values are ranged from 32.7 to 0.00048 when the HCl acidities vary from 0.10 to 10.0 M, showing that polonium can well be extracted by 0.75 M HDEHP in cyclohexane if the aqueous HCl acidities are 0.050 M and it will not be extracted if 0.10 M HCl; (2) D values are ranged from 47.1 to 0.0117 when the HNO3 acidities vary from 0.10 to 10.0 M, showing that polonium can be extractable by 0.75 M HDEHP in cyclohexane and in a wide range acidity of 4 M HNO3. The different extraction behaviours of polonium in 0.75 M HDEHP in cyclohexane and different acidities of HCl and HNO3 were found. The find- ings will be very helpful to improve the methods involving polonium decontamination for determination and separation of americium, curium as well as other radioelements in environmental soil, water and biological samples. Keywords: Polonium, HDEHP, distribution coefficients. 1. INTRODUCTION on its oxidation state. Therefore, question is raised: which oxidation state is responsible for major polonium volatility, The element polonium (210Po) was discovered by Marie valences of +2, +4, and probably +6? Curie as the first element separated from pitchblende, and named after her home country, Poland [1, 2]. -
The Development of the Periodic Table and Its Consequences Citation: J
Firenze University Press www.fupress.com/substantia The Development of the Periodic Table and its Consequences Citation: J. Emsley (2019) The Devel- opment of the Periodic Table and its Consequences. Substantia 3(2) Suppl. 5: 15-27. doi: 10.13128/Substantia-297 John Emsley Copyright: © 2019 J. Emsley. This is Alameda Lodge, 23a Alameda Road, Ampthill, MK45 2LA, UK an open access, peer-reviewed article E-mail: [email protected] published by Firenze University Press (http://www.fupress.com/substantia) and distributed under the terms of the Abstract. Chemistry is fortunate among the sciences in having an icon that is instant- Creative Commons Attribution License, ly recognisable around the world: the periodic table. The United Nations has deemed which permits unrestricted use, distri- 2019 to be the International Year of the Periodic Table, in commemoration of the 150th bution, and reproduction in any medi- anniversary of the first paper in which it appeared. That had been written by a Russian um, provided the original author and chemist, Dmitri Mendeleev, and was published in May 1869. Since then, there have source are credited. been many versions of the table, but one format has come to be the most widely used Data Availability Statement: All rel- and is to be seen everywhere. The route to this preferred form of the table makes an evant data are within the paper and its interesting story. Supporting Information files. Keywords. Periodic table, Mendeleev, Newlands, Deming, Seaborg. Competing Interests: The Author(s) declare(s) no conflict of interest. INTRODUCTION There are hundreds of periodic tables but the one that is widely repro- duced has the approval of the International Union of Pure and Applied Chemistry (IUPAC) and is shown in Fig.1. -
FRANCIUM Element Symbol: Fr Atomic Number: 87
FRANCIUM Element Symbol: Fr Atomic Number: 87 An initiative of IYC 2011 brought to you by the RACI KAYE GREEN www.raci.org.au FRANCIUM Element symbol: Fr Atomic number: 87 Francium (previously known as eka-cesium and actinium K) is a radioactive metal and the second rarest naturally occurring element after Astatine. It is the least stable of the first 103 elements. Very little is known of the physical and chemical properties of Francium compared to other elements. Francium was discovered by Marguerite Perey of the Curie Institute in Paris, France in 1939. However, the existence of an element of atomic number 87 was predicted in the 1870s by Dmitri Mendeleev, creator of the first version of the periodic table, who presumed it would have chemical and physical properties similar to Cesium. Several research teams attempted to isolate this missing element, and there were at least four false claims of discovery during which it was named Russium (after the home country of soviet chemist D. K. Dobroserdov), Alkalinium (by English chemists Gerald J. K. Druce and Frederick H. Loring as the heaviest alkali metal), Virginium (after Virginia, home state of chemist Fred Allison), and Moldavium (by Horia Hulubei and Yvette Cauchois after Moldavia, the Romanian province where they conducted their work). Perey finally discovered Francium after purifying radioactive Actinium-227 from Lanthanum, and detecting particles decaying at low energy levels not previously identified. The new product exhibited chemical properties of an alkali metal (such as co-precipitating with Cesium salts), which led Perey to believe that it was element 87, caused by the alpha radioactive decay of Actinium-227. -
Po and Pb in the Terrestrial Environment
Current Advances in Environmental Science (CAES) 210Po and 210Pb in the Terrestrial Environment Bertil R.R. Persson Medical Radiation Physics, Lund University S-22185 LUND, Sweden [email protected] Abstract- The natural sources of 210Po and 210Pb in the meat at high northern latitudes. This was, however, of terrestrial environment are from atmospheric deposition, soil natural origin and no evidence of significant contributions and ground water. The uptake of radionuclides from soil to of 210Po from the atomic bomb test was found. The most plant given as the soil transfer factor, varies widely between significant radionuclides in the fallout from the atmospheric various types of crops with an average about ± atomic bomb-test of importance for human exposure were The atmospheric deposition of 210Pb and 210Po also affect the 137Cs and 90Sr [4]. activity concentrations in leafy plants with a deposition th 210 210 transfer factor for Pb is in the order of 0.1-1 (m2.Bq-1) plants During the 1960 century the presence of Pb and and for root fruits it is < 0.003, Corresponding values for 210Po 210Po was extensively studied in human tissues and are about a factor 3 higher. particularly in Arctic food chains [4-20]. The activity concentration ratios between milk and various types of forage for 210Pb were estimated to ± and for In December of 2006, former Russian intelligence 210Po to ±By a daily food intake of 16 kg dry matter operative Alexander Litvinenko died from ingestion of a 210 210 per day the transfer coefficient Fm. for Pb was estimated to few g of Po. -
Cyclotron Produced Lead-203 P
Postgrad Med J: first published as 10.1136/pgmj.51.601.751 on 1 November 1975. Downloaded from Postgraduate Medical Journal (November 1975) 51, 751-754. Cyclotron produced lead-203 P. L. HORLOCK M. L. THAKUR L.R.I.C. M.Sc., Ph.D. I. A. WATSON M.Sc. MRC Cyclotron Unit, Hammersmith Hospital, Du Cane Road, London W12 OHS Introduction TABLE 1. Isotopes of lead Radioactive isotopes of lead occur in the natural Isotope Half-life Principal y energy radioactive series and have been used as decay 194Pb m * tracers since the early days of radiochemistry. These 195Pb 17m * are 210Pb (ti--204 y, radium D), 212Pb (t--10. 6 h, 96Pb 37 m * thorium B) and 214Pb (t--26.8 m, radium B) all of 197Pb 42 m * which are from occurring decay 197pbm 42 m * separated naturally 198pb 24 h * products ofradium or thorium. There are in addition 19spbm 25 m * Protected by copyright. to these a number of other radioactive isotopes of 199Pb 90 m * lead which can be produced artificially with the aid 19spbm 122 m * of a nuclear reactor or a accelerator 20OPb 21-5 h ** 0-109 to 0-605 (complex) charge particle (daughter radiations) (Table 1). 2Pb 9-4 h * There are at least three criteria in choosing the 0oipbm 61 s * radioactive isotope for in vitro tracer studies. First, 20pb 3 x 105y *** TI X-rays, (daughter it should emit radiation which is easily detected. radiations) have a half-life to 202pbm 3-62 h * Secondly, it should long enough aPb 52-1 h ** 0-279 (81%) 0-401 (5%) 0-680 permit studies without excessive radioactive decay 203pbm 6-1 s * (0-9%) (no daughter occurring but not so long that waste disposal radiations) creates a problem. -
2021 Transpacific Yacht Race Event Program
TRANSPACTHE FIFTY-FIRST RACE FROM LOS ANGELES 2021 TO HONOLULU 2 0 21 JULY 13-30, 2021 Comanche: © Sharon Green / Ultimate Sailing COMANCHE Taxi Dancer: © Ronnie Simpson / Ultimate Sailing • Hamachi: © Team Hamachi HAMACHI 2019 FIRST TO FINISH Official race guide - $5.00 2019 OVERALL CORRECTED TIME WINNER P: 808.845.6465 [email protected] F: 808.841.6610 OFFICIAL HANDBOOK OF THE 51ST TRANSPACIFIC YACHT RACE The Transpac 2021 Official Race Handbook is published for the Honolulu Committee of the Transpacific Yacht Club by Roth Communications, 2040 Alewa Drive, Honolulu, HI 96817 USA (808) 595-4124 [email protected] Publisher .............................................Michael J. Roth Roth Communications Editor .............................................. Ray Pendleton, Kim Ickler Contributing Writers .................... Dobbs Davis, Stan Honey, Ray Pendleton Contributing Photographers ...... Sharon Green/ultimatesailingcom, Ronnie Simpson/ultimatesailing.com, Todd Rasmussen, Betsy Crowfoot Senescu/ultimatesailing.com, Walter Cooper/ ultimatesailing.com, Lauren Easley - Leialoha Creative, Joyce Riley, Geri Conser, Emma Deardorff, Rachel Rosales, Phil Uhl, David Livingston, Pam Davis, Brian Farr Designer ........................................ Leslie Johnson Design On the Cover: CONTENTS Taxi Dancer R/P 70 Yabsley/Compton 2019 1st Div. 2 Sleds ET: 8:06:43:22 CT: 08:23:09:26 Schedule of Events . 3 Photo: Ronnie Simpson / ultimatesailing.com Welcome from the Governor of Hawaii . 8 Inset left: Welcome from the Mayor of Honolulu . 9 Comanche Verdier/VPLP 100 Jim Cooney & Samantha Grant Welcome from the Mayor of Long Beach . 9 2019 Barndoor Winner - First to Finish Overall: ET: 5:11:14:05 Welcome from the Transpacific Yacht Club Commodore . 10 Photo: Sharon Green / ultimatesailingcom Welcome from the Honolulu Committee Chair . 10 Inset right: Welcome from the Sponsoring Yacht Clubs . -
The Separation of Bismuth-213 from Actinium-225 and the Ion Exchange Properties of the Alkali Metal Cations with an Inorganic Resin
University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 12-2017 The Separation of Bismuth-213 from Actinium-225 and the Ion Exchange Properties of the Alkali Metal Cations with an Inorganic Resin Mark Alan Moore University of Tennessee Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Recommended Citation Moore, Mark Alan, "The Separation of Bismuth-213 from Actinium-225 and the Ion Exchange Properties of the Alkali Metal Cations with an Inorganic Resin. " PhD diss., University of Tennessee, 2017. https://trace.tennessee.edu/utk_graddiss/4848 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 Mark Alan Moore entitled "The Separation of Bismuth-213 from Actinium-225 and the Ion Exchange Properties of the Alkali Metal Cations with an Inorganic Resin." 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 Chemical Engineering. Robert Counce, Major Professor We have read this dissertation and recommend its acceptance: Paul Dalhaimer, Howard Hall, George Schweitzer, Jack Watson Accepted for the Council: Dixie L. Thompson Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) The Separation of Bismuth-213 from Actinium-225 and the Ion Exchange Properties of the Alkali Metal Cations with an Inorganic Resin A Dissertation Presented for the Doctor of Philosophy Degree The University of Tennessee, Knoxville Mark Alan Moore December 2017 Copyright © 2017 by Mark A. -
Public Works Department Irrigation
PUBLIC WORKS DEPARTMENT IRRIGATION Demand No - 40 N.T.P. SUPPLIED BY THE DEPARTMENT PRINTED AT GOVERNMENT CENTRAL PRESS, CHENNAI - 600 079. POLICY NOTE 2015 - 2016 O. PANNEERSELVAM MINISTER FOR FINANCE AND PUBLIC WORKS © Government of Tamil Nadu 2015 INDEX Sl. No. Subject Page 3.4. Dam Rehabilitation and 41 Sl. No. Subject Page Improvement Project 1.0. 1 (DRIP) 1.1.Introduction 1 4.0. Achievements on 45 Irrigation Infrastructure 1.2. 2 During Last Four Years 1.3. Surface Water Potential 4 4.1. Inter-Linking of Rivers in 54 1.4. Ground Water Potential 5 the State 1.5. Organisation 5 4.2. Artificial Recharge 63 Arrangement Structures 2.0. Historic Achievements 24 4.3. New Anicuts and 72 3.0. Memorable 27 Regulators Achievements 4.4. Formation of New Tanks 74 3.1. Schemes inaugurated by 27 / Ponds the Hon’ble Chief 4.5. Formation of New 76 Minister through video Canals / Supply conferencing on Channels 08.06.2015 4.6. Formation of New Check 81 3.2. Tamil Nadu Water 31 dams / Bed dams / Resources Consolidation Grade walls Project (TNWRCP) 4.7. Rehabilitation of Anicuts 104 3.3. Irrigated Agriculture 40 4.8. Rehabilitation of 113 Modernisation and Regulators Water-bodies Restoration and 4.9. Rehabilitation of canals 119 Management and supply channels (IAMWARM) Project Sl. No. Subject Page Sl. No. Subject Page 4.10. Renovation of Tanks 131 5.0. Road Map for Vision 200 4.11. Flood Protection Works 144 2023 4.12. Coastal Protection 153 5.1. Vision Document for 201 Works Tamil Nadu 2023 4.13. -
Struck Off 2019 International Business Companies Registry of Belize
International Business Companies Registry of Belize Struck Off 2019 IBC Number IBC Name 404 Management Services Limited 660 Central American Marketing Associates Inc. 713 Morimor Holding Ltd. 1,834 Diamond Investments Ltd. 1,936 The Weston Bird Trust, Inc. 2,220 Roma Intercambio S.A. 2,445 Belize.Com Ltd. 2,447 Pishon Trust Management Limited 2,628 B.F.D. Limited 3,371 Bartin Management Corp. 3,413 Loury Investment S.A. 3,594 Bordes Investments Corp. 3,826 Professional Management Ltd. 4,049 Vernon Management Corp. 4,770 Greenfield Group Limited 5,261 International Fitness Federation Inc. 5,474 Efl Inc. 6,266 Maxwinn Co., Ltd. 6,293 Zalls Enterprises Inc. 6,373 Prosperous Consultants Ltd. 6,423 Queensway Trading Corporation 6,637 Sun King International Limited 7,052 Transcom International Inc. 7,137 Universal Shipping Services Ltd. 7,385 Donnybrook Company Limited 7,562 Nabos Overseas Inc. 7,604 Spartan Management Limited 7,763 Victory Co., Ltd. 7,925 The Marginal Ltd. 8,120 Auspice International Ltd. 8,178 Aremac Co., Ltd. 8,218 Talents Consolidated, Inc. 8,251 Sanlin Enterprises Ltd. 8,366 New World Consultants Limited 8,519 P. Leasing Corporation Limited 8,825 Amazing Energy Industrial Co., Ltd. 9,444 Munogenics, Inc. 9,580 Fortrose Marketing Inc. 9,711 Ppe Industrial Corp. 10,741 Worldwide Telecom Holdings, Inc. 10,785 Castle Group Management Ltd. 10,874 Jeng Well Int'L Co., Ltd. 11,492 Atlax Ventures Limited 11,992 Killan Enterprises Inc. 12,685 Crosten Marketing Ltd. 12,775 Adeward Holding S.A. 12,801 Induha Industrie-Service S.A.