Soil Nuclide Distribution Coefficients and Their Statistical Distributions.

by Atomic Energy of Canada Limited.

Publisher: s.n in S.l

Written in English
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SeriesAtomic Energy of Canada Limited. AECL -- 8364
ContributionsSheppard, M., Beals, D., Thibault, D.
ID Numbers
Open LibraryOL21969172M

Descriptive statistics including means, standard deviation (SD), coefficient of variation (CV), the maximum values, minimum values, skewness and kurtosis for soil EC b (before and after interpolation) and cotton yield (before and after interpolation) from sampling points are summarized in .   Where z*(x 0) is the predicted value at position x 0, Z(x i) the known value at sampling site x i, λ i the weighting coefficient of the measured site and n is the number of sites within the neighborhood searched for the interpolation.. Semivariograms were used as the basic tool to examine the spatial distribution structure of the soil properties. Based on the regionalized variable theory and. These soil moisture parameters are required for the assessment of water flow and solute transport in unsaturated media. The method employs a statistical multiple regression equation proposed in the literature for estimating [ h (θ)] or [ K (θ)] relationships using the soil saturated water content and the percentages of sand and clay. The coefficient of sorting in sedimentary petrography is commonly considered to be the statistical measure introduced by Trask. Several investigators have objected to the use of the Trask coefficient on theoretical grounds. Others have continued to uphold its usefulness.

This report presents the results of a literature review to derive soil-to-plant concentration factors to predict the concentration of a radionuclide in plants from that in soil. The concentration factor, B/sub v/ is defined as the ratio of the concentration of a nuclide in the edible plant part to that in dry soil.   Extinct breeds have only recently undergone population declines, especially during the last decades of the 20th century. Thus, our data set encompasses all extant and recently extinct breeds, based on their historical distributions, prior to being exposed to the effects of agricultural intensification over the last decades (Tisdell, ). Caterpillar Payment of Dividends and Other Cash Distributions is comparatively stable at the moment as compared to the past year. Caterpillar reported Payment of Dividends and Other Cash Distributions of ( Billion) in Analyze Caterpillar Payment of Dividends and Other Cash Distributions. Background. Two approaches are commonly investigated for statistical and spatial analysis of soil roughness at these scales. In the first one, the surface roughness is characterized as a whole by its autocorrelation function model or by its variogram and is summarized by statistical indices: root mean square of heights, correlation length, roughness exponent or Hurst coefficient.

Introduction. Modeling the size distribution of soil particles to obtain a continuous particle size distribution (PSD) curves is useful for understanding essential soil properties such as pore distribution, water retention, hydraulic conductivity, and thermal and adsorption properties [1–4].However, conventional PSD analysis captures only a limited number of particle mass fractions. Here are some facts about the F distribution.. The curve is not symmetrical but skewed to the right. There is a different curve for each set of dfs.; The F statistic is greater than or equal to zero.; As the degrees of freedom for the numerator and for the denominator get . The variance test attained a significant level of , indicating these elements and their distribution are mainly controlled by human activity. The activities that had a significant influence on these soil salt properties include agricultural activities, such as irrigating, fertilizing and farming. Introduction. Soil microorganisms are the most abundant and diverse living organisms on earth and are key players in the biogeochemical cycles. However, the environmental factors shaping soil microbial community abundance and assembly are still unclear, which limits our understanding of the role of soil biodiversity in ecosystem services (Gardi et al. ).

Soil Nuclide Distribution Coefficients and Their Statistical Distributions. by Atomic Energy of Canada Limited. Download PDF EPUB FB2

SOIL NUCLIDE DISTRIBUTION COEFFICIENTS AND THEIR STATISTICAL DISTRIBUTIONS by Marsha I. Sheppard, Donald I. eals, Denis H. Thibault and Patrick OConnor ABSTRACT Environmental assessments of the disposal of nuclear fuel waste in plutonic rock formations require analysis of the migration of nuclides from the disposal vault to the bosphere.

SOIL NUCLIDE DISTRIBUTION COEFFICIENTS AND THEIR STATISTICAL DISTRIBUTIONS COEFFICIENTS DE REPARTITION DES NUCLIDES DANS LE SOL ET LEUR REPARTITION STATISTIQUE Marsha I.

Sheppard, Donald I. Beals, Denis H. Thibault Patrick O'Connor Whiteshell Nuclear Research Etablissement de recherches. Abstract. A basic idea concerning collections of soil observations is to obtain statistical parameters from the data distribution.

In soil, we recognise two kinds of statistical distributions relating to discrete or continuous random by: 1. Solid/liquid partition coefficients, also known as distribution coefficients and Kd, have been used in safety assessment calculations for nuclear facilities for many years.

They endure because of their conceptual simplicity. The Kd is the ratio of the concentration of a nuclide on a solid phase (soil orCited by:   A general approach is presented to derive probabilistic radionuclide distribution coefficients (K d) in soils from a K d dataset.

The main aim was to derive informed estimates with a low inherent uncertainty by restricting the K d value data to subsets based on key soil factors and the experimental approach used to calculate the K d value (e.g., sorption and desorption tests).Cited by: 2.

Soil nuclide distribution coefficients and their statistical distributions. Atomic Energy of Canada Limited Report, (). Sources of exposure to technologically enhanced radiation. Study of leaching and migration ofradium in soils. The dependencies of nuclide distribution on soil parameters have been evaluated.

Abstract. In this study it is shown how radionuclide distributions in agricultural soils and their dependence on soil parameters can be quantitatively estimated. The most important sorption and speciation processes have been implemented into a numerical model using.

In a series of laboratory studies, we determined the solid to liquid distribution coefficient, K d, for iodine ( I) in Canadian Shield lake sediments and the loss rate of I from water to sediment for more accurate computer model predictions of the fate of I released from an underground disposal vault.

The K d values were determined under oxic and anoxic (reducing). Statistical characteristics Possible probability distributions. Upon comparing the measured probabilities of the thermal conductivities of the frozen clay samples with various classic probability distributions in mathematical statistics, we find that the normal distribution, lognormal distribution, Weibull distribution and gamma distribution are able to describe the distributions of.

Hypergeometric distribution Multinomial distribution Negative Binomial or Pascal and Geometric distribution Poisson distribution Soil Nuclide Distribution Coefficients and Their Statistical Distributions.

book distribution Zipf or Zeta distribution Continuous univariate distributions Beta distribution Chi-Square distribution This report presents element-specific soil solid/liquid partition coefficients based o a detailed survey of the literature.

Values for clays, silt, sand and organic soils are summarized. Soil nuclide distribution coeffients and their statistical distributions. Atomic Energy of Canada Limited Report, AECL   Statistics on coefficients of variation for Cs concentrations among five soil samples collected at one location.

The coefficient of variation represents the ratio of the standard deviation to the mean. The number of soil sampling locations within a certain range of the coefficient of variation is shown by a bar graph. The topic of accurate prediction of soil permeability is of importance to geotechnical engineers and researchers.

The coefficient of permeability (k), defined as the mean discharge velocity of the fluid flow through a porous medium for a unit hydraulic gradient, is principally dependent on the size and connectivity of the pore voids, which are related to the size distribution and shape of the.

The distribution of selected elements and minerals in soil of the conterminous United States Laurel Woodruff a,⁎, William F. Cannonb, David B. Smithc, Federico Solanob a U.S. Geological Survey, Woodale Drive, St.

Paul, MNUSA b U.S. Geological Survey, Mail Stop National Center, Reston, VAUSA c U.S. Geological Survey, Mail Stop Denver Federal Center, Denver, CO. Distributions of radionuclide sorption coefficients (K-d) in sub-surface sediments and the implications for transport calculations Article in Journal of Environmental Radioactivity (10) In this study, distribution coefficients (K d s) of five radionuclides (54Mn, 60Co, 65Zn, 85Sr, Cs) were measured by a batch technique for 36 agricultural soils (paddy and upland soils) collected in Japan.

Twelve properties of the soils and measured K d ss were examined for their probability distributions. Soil properties showed log-normal type distributions, except pH(H2O), and total.

The analysis of literature sources and a database on soil physical properties collected by the Department of Soil Physics and Amelioration of Soils of the Faculty of Soil Science of Moscow State University made it possible to compare three major constituents of the particle-size distribution analysis (PSDA): (a) the classification of soil separates with respect to their sizes and the.

Results are presented for a granulometric analysis of lunar soils obtained at the landing sites of Luna 16 and 20 and Apollo It is shown that the mean particle sizes (Mz) and their logarithmic standard deviations (sigma i) are related individually for each sampled region of the moon by the equation Mz = a-b times sigma i.

> The coefficients a and b are determined for the soils from the. Lecture 2: Grain Size Distributions and Soil Particle Characteristics A. Motivation: In soil mechanics, it is virtually always useful to quantify the size of the grains in a type of soil.

Since a given soil will often be made up of grains of many different sizes, sizes are measured in terms of grain size distributions. Multivariate Statistical Simulation A Guide to Selecting and Generating Continuous Multivariate Distributions.

The Field Book for Describing and Sampling Soils, version (Schoeneberger, Wysocki, Benham, and Soil Survey Staff, ) is a 4" x 7" spiral-bound publication printed on waterproof tabs mark Field Book chapters and sections for quick, easy reference.

Early chapters address Site Description, Soil Profile/Pedon Description, and Geomorphology. Vertical distribution and inventories of ()Cs have been determined using radiocesium distributions in presumably undistributed soil profiles, collected from 36 sites distributed all over Syria.

The soil-contaminant interaction is significantly influenced by various attributes of soil and contaminant, and it can be quantified by employing a term known as distribution coefficient (k d).However, because of the involvement of many parameters related to soil and contaminant, determination of k d becomes a tedious and time-consuming exercise that requires extensive experimental investigations.

Polyacrylamide (PAM) was studied in two characteristic soils in Daqing City: chernozem and saline soil. mg L-1 of KBr was used as a conservation tracer to estimate diffusion coefficients and.

We examine probabilistic elements of how cosmogenic nuclide (e.g., 10 Be) concentrations and optically stimulated luminescence (OSL) particle ages are distributed within a soil mantle near a hillslope crest as a consequence of disturbance‐driven transport and particle mixing.

We use an Eulerian‐Lagrangian algorithm in which fluctuating particle motions, representing depth‐dependent. ters in several soil classifications. A family of statistical distri­ butions can be used advantageously to provide a commonality of form that permits correlations to be incorporated.

The family of distributions known as the Johnson system [Johnson and Kotz, ; Johnson, ] was used here for this pur­ pose. Gerga district contains different activities, urban, agriculture, and industry, which can impact adversely on the soil quality.

Sixteen samples of the agricultural soil (0–cm depth) were collected to investigate the pollution of soil with trace elements (Co, Ni, Pb, and Mn). The statistical techniques were applied to discriminate the sources of these elements.

The studied soil ranged from. The Goals of Data Collection and Its Statistical Treatment in the Earth Sciences The earth sciences are characterised by loose and complex relationships between variables, and the necessity to understand the geographical dis tribution of observations as well as their frequency distribution.

Our fre quency distributions and the looseness of relationships reflect the com plexity and intrinsic. Analytical, Diagnostic and Therapeutic Techniques and Equipment Normal Distribution Models, Statistical Probability Transducers Markov Chains Poisson Distribution Binomial Distribution Models, Theoretical APACHE Biostatistics Bayes Theorem Models, Biological.

SOIL SCI. SOC. J., VOL. 54, MARCH-APRIL that are substantially better than those that have been previously applied or recommended in common sta-tistical text books. In a previous study (Parkin et al., ), we re-ported on three methods for estimating the mean, var-iance, and coefficient of variation for lognormally dis.

The unit-Rayleigh distribution is a one-parameter distribution with support on the unit interval. It is defined as the so-called unit-Weibull distribution with a shape parameter equal to two. As a particular case among others, it seems that it has not been given special attention.

This paper shows that the unit-Rayleigh distribution is much more interesting than it might at first glance.Frequency distribution of 90 Sr in soil samples collected from the exclusion zone of FDNPP in (n = 16). Correlation The correlation between the 90 Sr and Cs concentration in the soil samples collected from the exclusion zone of the FDNPP is moderate as can be seen in Fig.

4.Fractal features of soil particle-size distribution as affected by plant communities in the forested region of Mountain Yimeng, China Xia Liua, Guangcan Zhanga, Gary C. Heathmanb,⁎, Yaqin Wangc, Chi-hua Huangb a Shandong Agricultural University, Ecology and Environment Key Laboratory, Taian, Shandong, China b USDA-ARS-MWA, National Soil Erosion Research Laboratory, West Lafayette, IN.