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Saturday, July 11, 2020 | History

3 edition of Nuclide concentration factors for freshwater biota found in the catalog.

Nuclide concentration factors for freshwater biota

G. A. Bird

Nuclide concentration factors for freshwater biota

by G. A. Bird

  • 227 Want to read
  • 9 Currently reading

Published by AECL, Whiteshell Laboratories in Pinawa, Man .
Written in English

    Subjects:
  • Radioisotopes -- Environmental aspects -- Canada.,
  • Radioactive pollution of water -- Canada.,
  • Radioactive waste disposal in the ground -- Environmental aspects -- Canada.,
  • Water -- Pollution.

  • Edition Notes

    Statementby G.A. Bird, W. Schwartz.
    SeriesTechnical record (Atomic Energy of Canada Ltd) -- no. 703
    ContributionsSchwartz, W., Atomic Energy of Canada Limited., Whiteshell Laboratories. Environmental Science Branch.
    Classifications
    LC ClassificationsTK"9001"T4"no.703
    The Physical Object
    Pagination85 p. :
    Number of Pages85
    ID Numbers
    Open LibraryOL20641812M

      Abstract. A radiation dose assessment exercise was carried out for the edible biota Solanum nigrum, Carica papaya, Raphnus sativum and Phaseolus domesticus due to naturally available radionuclides 40 K, U and Th in the Domiasiat area in Meghalaya, India. The concentration of radionuclides in biota and corresponding soil was measured by the NaI(Tl) detector having a Author: N. Kumar, S. S. Chaturvedi, S. K. Jha. (p. 52), and these ratios are known as Cl-ratios and chlorosity factors, respectively. The Cl-ratio is the amount of any ion or substance per unit (gram) of chlorinity, and is obtained by dividing the concentration in grams per kilogram by the chlorinity, or the concentration .

    After the first day, tissue-free-water tritium in all biota approached an equilibrium with pond water. Final concentration factors of , , , , , were calculated for carp, clam, crayfish, snail, periphyton, and pondweed. Book: Introductory Biology (CK) 6: Ecology their main limiting factors are the availability of sunlight and the concentration of dissolved oxygen and nutrients in the water. These factors vary from place to place in a body of water and are used to define aquatic biomes. Aquatic Biomes and Sunlight. In large bodies of standing water.

    Uranium. The primordial uranium found ubiquitously in nature consists of two isotopes with mass numbers of and In the earth's crust, U constitutes % of the uranium by mass, and U, the parent isotope of the actinium chain, %. U, a shorter-lived member of the U chain, is usually in radioactive equilibrium or near-equilibrium with the parent isotope. The genus Daphnia includes more than known species of freshwater plankton organisms found around the world (see Figures , , and for three European representatives of the genus). They inhabit most types of standing freshwater except for extreme habitats, such as hot age classes are good swimmers and are mostly pelagic, i.e., found in the open by:


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Nuclide concentration factors for freshwater biota by G. A. Bird Download PDF EPUB FB2

@article{osti_, title = {Bioaccumulation factors for radionuclides in freshwater biota}, author = {Vanderploeg, H A and Parzyck, D C and Wilcox, W H and Kercher, J R and Kaye, S V}, abstractNote = {This report analyzes over carefully selected papers to provide concise data sets and methodology for estimation of bioaccumulation factors for tritium and isotopes of strontium, cesium.

In many publications, which represent a valuable source of CR values for freshwater biota, the data are reported as activity concentration for dry weight (or in some cases for ash weight). In such cases, species-dependent conversion factors (the fresh weight equivalents) are required to convert dry weight CR values to fresh by: Distribution Coefficients and Concentration Factors for Biota in the Marine Environment (Technical Reports Series No.

), covering newly obtained data as well as changes in the regulatory framework. Inwithin the framework of the Environmental Modelling for Radiation Safety (EMRAS) programme, the IAEA undertook a revision of. This table contains the most up to date criteria for aquatic life ambient water quality criteria.

Aquatic life criteria for toxic chemicals are the highest concentration of specific pollutants or parameters in water that are Nuclide concentration factors for freshwater biota book expected to pose a significant risk to the majority of species in a given environment or a narrative description of the desired conditions of a water body being "free.

Transfer of radionuclides in aquatic ecosystems – Default concentration ratios for aquatic biota in the Erica Tool Author links open overlay panel A. Hosseini a H. Thørring a J.E. Brown a R. Saxén b E.

Ilus bCited by: We are delighted to announce that we are now highlighting research in Freshwater Biology with an attractive author-contributed image, which will be featured free of charge.

We welcome your suggestions of images that meet the following specifications: mm width, mm height and dpi resolution. CR t can be defined as the ratio between the nuclide concentration in the tissue of interest and the concentration in a Reference Tissue for which a large amount of data are available.

For example, for teleost fishes, muscle can be used as a Reference Tissue (Yankovich and Beaton, ).Cited by: Effect of water chemistry on biota concentration factor (CF). Correlations between biota CF and salinity, SS, TOC, and pH of lakes (triangle) and rivers (circle).

The lines show averaged GLM predictions for each component when the effects of the variables were by: 1. In the IAEA published Technical Reports Series No (TRS ), Sediment K d s and Concentration Factors for Radionuclides in the Marine Environment,which provided sediment distribution coefficients (K d s) and con-centration factor (CF) data for.

Biota sediment accumulation factor of Cs for biota.-i 6ttu*u river was from to (Rowan et al,) The derived parameter, CR, can be used.

aquatic biota to incur effects from exposure to chronic low-level radiation in the environment. Aquatic organisms inhabiting an environment contaminated with radioactivity receive external radiation from radionuclides in water, sediment, and from other biota such as vegetation.

Aquatic organisms receive internal radiation from radionuclides ingested viaFile Size: KB. An allometric scaling approach has been used to calculate biological half-lives of elimination (TB1/2) and concentration factors (CF) for radionuclides in marine biota.

Ra nuclide concentration is higher in the middle depths (55 – 90 Bq/kg) th an other natural nuclides while at the bottom m U content is the highest (90 – Bq/kg).Author: Alexander Strezov. Abstract. The ubiquitous detection of microplastics in aquatic ecosystems promotes the concern for adverse impacts on freshwater ecosystems.

The wide variety of material types, sizes, shapes, and physicochemical properties renders interactions with biota via multiple pathways by:   The concentration factors used are given in table 8.

These largely reflect the compilation produced by the FASSET project (Brown et al ), supplemented in some instances by values derived from the Alligator Rivers system data.

The data are sparse and little information is available on the likely variability of concentration factor values. Methods for calculating dose conversion coefficients for terrestrial and aquatic biota Article in Journal of Environmental Radioactivity 99(9) April with Reads How we measure.

Transfer of radionuclides in aquatic ecosystems - Default concentration ratios for aquatic biota in the Erica Tool April Journal of Environmental Radioactivity 99(9)   The Perch Lake Freshwater Scenario (Yankovich ) was undertaken to: (1) compare measured activity concentrations of 90 Sr, Cs, 60 Co and 3 H in a range of freshwater biota from Perch Lake to values predicted by the participating models; and (2) to conduct a model-to-model comparison of predicted unweighted absorbed dose rates to biota Cited by: The maximum Cs levels were detected in reindeer, freshwater fish and mushrooms.

Parameters possibly affecting the nuclide concentration in different biota are briefly discussed. INTRODUCTION After the nuclear accident at Chernobyl, U.S.S.R., substantial amounts of radioactive materials were released and transported by air masses towards by: EPA/ May CONCENTRATION FACTORS AND TRANSPORT MODELS FOR RADIONUCLIDES IN AQUATIC ENVIRONMENTS A LITERATURE REPORT By Robert G.

Patzer Monitoring Systems Research and Development Division Environmental Monitoring and Support Laboratory Las Vegas, Nevada ENVIRONMENTAL MONITORING AND SUPPORT LABORATORY. 6 ATTACHMENT F METHODOLOGY FOR ESTIMATING DOSES TO NON-HUMAN BIOTA Table 2.

Concentration ratios for terrestrial ecosystem from ICRP [] Element Organism Concentration ratio (Bq kg-1 f.w. per Bq kg-1 d.w.) Cs Pine tree/tree × I File Size: KB.For instance, Polikarpov13 gives a mean concentration factor of 24, for 32P accu­ mulation in freshwater plants and a mean concentration factor of for freshwater Size: 1MB.An exercise to compare 10 approaches for the calculation of unweighted whole-body absorbed dose rates was conducted for 74 radionuclides and five of the ICRP's Reference Animals and Plants, or RAPs (duck, frog, flatfish egg, rat and elongated earthworm), selected for this exercise to cover a range.