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Uranium




  • 1.
    The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
    Peer
    Reviewed
    Journal
    Article
    Covariate adjustment of event histories estimated from Markov chains: the additive approach

    Authors: Aalen, OO; Borgan, O; Fekjaer, H
    (2001) Biometrics 57:993-1001.
    Minus Sign. Click to see only selected choices. Markov chain models are frequently used for studying event histories that include transitions between . . . Plus Sign. Click to expand choices. Markov chain models are frequently used for studying event histories that include transitions between several states. An empirical transition matrix for nonhomogeneous Markov chains has previously been developed, including a detailed statistical theory based on counting processes and martingales. In this article, we show how to estimate transition probabilities dependent on covariates. This technique may, e.g., be used for making estimates of individual prognosis in epidemiological or clinical studies. The covariates are included through nonparametric additive models on the transition intensities of the Markov chain. The additive model allows for estimation of covariate-dependent transition intensities, and again a detailed theory exists based on counting processes. The martingale setting now allows for a very natural combination of the empirical transition matrix and the additive model, resulting in estimates that can be expressed as stochastic integrals, and hence their properties are easily evaluated. Two medical examples will be given. In the first example, we study how the lung cancer mortality of uranium miners depends on smoking and radon exposure. In the second example, we study how the probability of being in response depends on patient group and prophylactic treatment for leukemia patients who have had a bone marrow transplantation. A program in R and S-PLUS that can carry out the analyses described here has been developed and is freely available on the Internet.
    Tagged With: Pubmed, WOS, Merged reference set, Secondary Refinement, Retained for manual screening, Excluded:, Not chemical specific , Toxnet, PubMed, Uranium Update 3/2017, Pubmed
  • 2.
    Journal Article
    Journal
    Article
    Shielding concepts for low-background proportional counter arrays in surface laboratories

    Authors: Aalseth, CE; Humble, PH; Mace, EK; Orrell, JL; Seifert, A; Williams, RM
    (2016)
    Minus Sign. Click to see only selected choices. Development of ultra low background gas proportional counters has made the contribution from naturally . . . Plus Sign. Click to expand choices. Development of ultra low background gas proportional counters has made the contribution from naturally occurring radioactive isotopes - primarily α and β activity in the uranium and thorium decay chains - inconsequential to instrumental sensitivity levels when measurements are performed in above ground surface laboratories. Simple lead shielding is enough to mitigate against gamma rays as gas proportional counters are already relatively insensitive to naturally occurring gamma radiation. The dominant background in these surface laboratory measurements using ultra low background gas proportional counters is due to cosmic ray generated muons, neutrons, and protons. Studies of measurements with ultra low background gas proportional counters in surface and underground laboratories as well as radiation transport Monte Carlo simulations suggest a preferred conceptual design to achieve the highest possible sensitivity from an array of low background gas proportional counters when operated in a surface laboratory. The basis for a low background gas proportional counter array and the preferred shielding configuration is reported, especially in relation to measurements of radioactive gases having low energy decays such as (37)Ar.
    Tagged With: Uranium Update 3/2017, WOS
  • 3.
    The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
    Peer
    Reviewed
    Journal
    Article
    Formation of isomers in the reaction 238U(p,3n)236Np

    Authors: Aaltonen; Brenner; Egorov; Fridkin; Funschtein; Gromova; Manngrd; Rubchen'a; Selitsky; Yakovlev; Zenkevich
    (1990) Physical Review C (Nuclear Physics) 41:513-516.
    Tagged With: Pubmed, Merged reference set, Secondary Refinement, Excluded
  • 4.
    The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
    Peer
    Reviewed
    Journal
    Article
    Europium-155 in debris from nuclear weapons

    Authors: Aarkrog, A; Lippert, J
    (1967)
    Minus Sign. Click to see only selected choices. The lithium-drifted germanium detector enables determination of europium-155 on a routine basis in environmental . . . Plus Sign. Click to expand choices. The lithium-drifted germanium detector enables determination of europium-155 on a routine basis in environmental samples contaminated with debris from nuclear weapons. From measurements of europium-155, cesium-144, and strontium-90 in air filters collected between 1961 and 1966, the yield of europium-155 from weapons was estimated at 1400 atoms per 10(6) fissions, which is close to the yield of europium-155 from fast fission of uranium-238.
    Tagged With: Uranium Update 3/2017, Toxnet
  • 5.
    Technical Report
    Technical
    Report
    XAF/XANES studies of plutonium-loaded sodalite/glass composite waste forms

    Authors: Aase, SB; Kropf, AJ; Lewis, MA; Reed, DT; Richmann, MK
    (1999)
    Minus Sign. Click to see only selected choices. A sodalite/glass ceramic waste form has been developed to immobilize highly radioactive nuclear wastes . . . Plus Sign. Click to expand choices. A sodalite/glass ceramic waste form has been developed to immobilize highly radioactive nuclear wastes in chloride form, as part of an electrochemical cleanup process. Simulated waste forms have been fabricated which contain plutonium and are representative of the salt from the electrometallurgical process to recover uranium from spent nuclear fuel. X-ray absorption fine structure spectroscopy (XAFS) and x-ray absorption near-edge spectroscopy (XANES) studies were performed to determine the location, oxidation state and form of the plutonium within these waste forms. Plutonium, in the non-fission-element case, was found to segregate as plutonium(IV) oxide with a crystallite size of at least 20 nm. With fission elements present, the crystallite size was about 2 nm. No plutonium was observed within the sodalite or glass in the waste form.
    Tagged With: Uranium Update 3/2017, Toxnet

    Details
       
  • 6.
    The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
    Peer
    Reviewed
    Journal
    Article
    Assessment of gamma-emitting radionuclides in sediment cores from the Gulf of Aqaba, Red Sea

    Authors: Ababneh, ZQ; Al-Omari, H; Rasheed, M; Al-Najjar, T; Ababneh, AM
    (2010) Radiation Protection Dosimetry 141:289-298.
    Minus Sign. Click to see only selected choices. The Gulf of Aqaba is the only seaport in Jordan which currently has intense activities such as industrial . . . Plus Sign. Click to expand choices. The Gulf of Aqaba is the only seaport in Jordan which currently has intense activities such as industrial development, phosphate ore exportation, oil importation, shipping, commercial and sport fishing. Most of these activities, especially the phosphate ore exportation, could cause serious radiological effects to the marine environment. Thus, it is essential to investigate the level of the radioactivity concentrations to establish a baseline database, which is not available yet in the Gulf of Aqaba. Radioactivity concentrations of gamma-emitting radionuclides in core and beach sediments of the Gulf of Aqaba were investigated. Core sediments were collected from five representative locations for three different water column depths (5, 15 and 35 m). The results showed that the activity concentrations of 238U, 235U and 226Ra for both seafloor and beach sediments from the phosphate loading berth (PLB) location to be higher than those from other investigated locations and more than twice as high as the worldwide average; the 238U activity concentration was found to vary from 57 to 677 Bq kg(-1). The results also showed that there is little variation of radioactivity concentrations within the core length of 15 cm. The calculated mean values of the radium equivalent activity Ra(eq), the external hazard index, H(ex), the absorbed dose rate and the annual effective dose for the beach sediment in PLB location were 626 Bq kg(-1), 1.69, 263 nGy h(-1) and 614 µSv y(-1), respectively. These values are much higher than the recommended limits that impose potential health risks to the workers in this location. As for other studied locations, the corresponding values were far below the maximum recommended limit and lies within the worldwide range.
    Tagged With: Pubmed, Merged reference set, Secondary Refinement, Retained for manual screening, Excluded:, Not chemical specific , Uranium Update 3/2017, Toxnet, PubMed
  • 7.
    The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
    Peer
    Reviewed
    Journal
    Article
    The effect of geological structure on radon concentration dissolved in groundwater in nearby Anar fault based on a statistical analysis

    Authors: Abadi, AAM; Rahimi, M; Koopaei, LJ
    (2016)
    Minus Sign. Click to see only selected choices. The radon concentration in groundwater is due to amount of uranium existing in rocks and geological . . . Plus Sign. Click to expand choices. The radon concentration in groundwater is due to amount of uranium existing in rocks and geological structures. Radon concentration in 33 groundwater samples from agricultural and drinking wells surrounding Anar fault have measured by RAD7 radon detector. The measured values ranged from 1.33 +/- 0.48 to 29.91 +/- 3.64 Bq L-1. The results show radon concentration varies by distance from main fault and main stream in which the effect of main fault is more than main stream.
    Tagged With: Uranium Update 3/2017, WOS
  • 8.
    The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
    Peer
    Reviewed
    Journal
    Article
    Possibility of long-term nuclear power development based on today's technology

    Authors: Abagyan, AA; Seleznev, EF; Ivanov, VB
    (2004)
    Minus Sign. Click to see only selected choices. The possibility of long-term nuclear power development with a uranium fuel cycle based on U-238 burnup . . . Plus Sign. Click to expand choices. The possibility of long-term nuclear power development with a uranium fuel cycle based on U-238 burnup and today's industrial technology is investigated. It is shown that such development is possible with fast reactors, including with sodium coolant. In this case, incomplete fuel reprocessing is admissable in a closed fuel cycle employing a pyroelectrochemical technology, which allows some fission products and actinides to be present in the fresh fuel prepared for reloading after reprocessing. These fission products and actinides can be burned in a reactor, thereby decreasing the quantity of radioactive wastes compared with the complete reprocessing with chemical separation of the fuel elements and decreasing the radiation load on the environment.
    Tagged With: WOS, Merged reference set, Secondary Refinement, Retained for manual screening, Additional Resource, Reviews/editorials

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  • 9.
    The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
    Peer
    Reviewed
    Journal
    Article
    Enantioselective disposition of 2-arylpropionic acid nonsteroidal anti-inflammatory drugs. IV. Ketoprofen disposition

    Authors: Abas, A; Meffin, PJ
    (1987) Journal of Pharmacology and Experimental Therapeutics 240:637-641.
    Minus Sign. Click to see only selected choices. The disposition of ketoprofen enantiomers has been studied in 12 rabbits with normal renal function . . . Plus Sign. Click to expand choices. The disposition of ketoprofen enantiomers has been studied in 12 rabbits with normal renal function (control) and in 6 of these rabbits with renal dysfunction. In control animals a mean (S.E.M.) of 0.09 (0.01) of R-ketoprofen was inverted to its S-enantiomer. The mean distribution volumes for R- and S-ketoprofen were 114 (7.4) and 294 (76) ml/kg, respectively. The mean clearance of the R-enantiomer from plasma was 292 (40) ml/kg/hr compared to 36 (3.2) ml/kg/hr for the S-enantiomer. This high degree of enantioselectivity was not due to inversion, renal clearance or clearance by glucuronidation, but was the result of an unknown clearance process(es). Comparing the mean parameters of ketoprofen disposition in renal dysfunction with those in the same animals during the control study, the mean fraction of the R-dose inverted increased by 290%, but this effect was not due to decreased clearance of R-ketoprofen renally or by glucuronidation. The distribution volumes of R- and S-ketoprofen were increased by 200 and 183% by renal dysfunction, consistent with an implied decrease in plasma protein binding. The clearances of bound plus unbound R- and S-ketoprofen from plasma remained unaltered by renal dysfunction.
    Tagged With: Pubmed, Merged reference set, Secondary Refinement, Retained for manual screening, Excluded:, Not chemical specific , Uranium Update 3/2017, Toxnet
  • 10.
    Journal Article
    Journal
    Article
    Evaluation of heat generation by radioactive decay of sedimentary rocks in Eastern Desert and Nile Valley, Egypt

    Author: Abbady, AG
    (2010)
    Minus Sign. Click to see only selected choices. Radioactive heat-production (RHP) data of sedimentary outcrops in Gebel Anz (Eastern Desert) and Gebel . . . Plus Sign. Click to expand choices. Radioactive heat-production (RHP) data of sedimentary outcrops in Gebel Anz (Eastern Desert) and Gebel Sarai (Nile Valley) are presented. A total of 103 rock samples were investigated, covering all major rock types of the areas. RHP were derived from uranium, thorium and potassium concentrations measured from gamma-radiation originating from the decay of (214)Bi ((238)U series), (208)Tl ((232)Th series) and the primary decay of (40)K, obtained with a NaI (Tl) detector. The heat-production rate of Gebel Anz ranges from 0.94 (Nubai Sandstone ) to 5.22 microW m(-3) (Duwi Formation). In Gebel Sarai it varies from 0.82 (Esna Shale) to 7 microW m(-3) (Duwi Formation). The contribution due to U is about 62%, from Th is 34% and 4% from K in Gebel Anz. The corresponding values in Gebel Sarai are 69.6%, 26.9% and 3.5%, respectively. These data can be used to discuss the effects of the lateral variation of the RHP rate on the heat flux and the temperature fields in the upper crust.
    Tagged With: Uranium Update 3/2017, Toxnet
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