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J N B Bell - One of the best experts on this subject based on the ideXlab platform.
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radionuclide transport above a near surface water Table III soil migration and crop uptake of three gamma emitting radionuclides 1990 to 1993
Journal of Environmental Quality, 2001Co-Authors: P Wadey, G Shaw, J N B BellAbstract:This paper summarizes the vertical distributions of 22 Na, 137 Cs, and 60 Co above controlled water Tables in deep and shallow lysimeters during a four-year experiment. The activity concentration profiles were all determined at the time of harvest of a winter wheat (Triticum aestivum L. cv. Pastiche) crop. Activity concentrations in different crop tissues were determined and crop uptake expressed as both an inventory ratio (IR) and a transfer factor (TF w ), weighted to account for root and radionuclide distributions within the soil profile. Experimental variates were subjected to analysis of variance to determine the single and combined effects of the soil depth and the year of the experiment on the results obtained. Each radionuclide showed significant variations in activity concentration with soil depth, but the significance of these variations from year to year was dependent on radionuclide. A distinction in the behavior of weakly sorbed ( 22 Na) and more highly sorbed ( 137 Cs and 60 Co) radionuclides was observed. The former exhibited significant variations in its distribution in the soil profile from year-to-year whereas the latter did not. Relatively high TF w values for 22 Na were maintained throughout the experiment, whereas for 137 Cs and 60 Co, the highest TF w values were recorded in 1990 followed by a significant decline in 1991, with TF w remaining low in 1992 and 1993. The TF w values were, in general, significantly higher for deep lysimeters than for shallow lysimeters. This is thought to provide evidence of enhanced radionuclide absorption by the relatively small fraction of roots in the vicinity of the deeper water Table.
P Wadey - One of the best experts on this subject based on the ideXlab platform.
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radionuclide transport above a near surface water Table III soil migration and crop uptake of three gamma emitting radionuclides 1990 to 1993
Journal of Environmental Quality, 2001Co-Authors: P Wadey, G Shaw, J N B BellAbstract:This paper summarizes the vertical distributions of 22 Na, 137 Cs, and 60 Co above controlled water Tables in deep and shallow lysimeters during a four-year experiment. The activity concentration profiles were all determined at the time of harvest of a winter wheat (Triticum aestivum L. cv. Pastiche) crop. Activity concentrations in different crop tissues were determined and crop uptake expressed as both an inventory ratio (IR) and a transfer factor (TF w ), weighted to account for root and radionuclide distributions within the soil profile. Experimental variates were subjected to analysis of variance to determine the single and combined effects of the soil depth and the year of the experiment on the results obtained. Each radionuclide showed significant variations in activity concentration with soil depth, but the significance of these variations from year to year was dependent on radionuclide. A distinction in the behavior of weakly sorbed ( 22 Na) and more highly sorbed ( 137 Cs and 60 Co) radionuclides was observed. The former exhibited significant variations in its distribution in the soil profile from year-to-year whereas the latter did not. Relatively high TF w values for 22 Na were maintained throughout the experiment, whereas for 137 Cs and 60 Co, the highest TF w values were recorded in 1990 followed by a significant decline in 1991, with TF w remaining low in 1992 and 1993. The TF w values were, in general, significantly higher for deep lysimeters than for shallow lysimeters. This is thought to provide evidence of enhanced radionuclide absorption by the relatively small fraction of roots in the vicinity of the deeper water Table.
P Tikkanen - One of the best experts on this subject based on the ideXlab platform.
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TRANSITION PROBABILITY FROM THE GROUND TO THE FIRST-EXCITED 2+ STATE OF EVEN–EVEN NUCLIDES
Atomic Data and Nuclear Data Tables, 2001Co-Authors: S Raman, C W Nestor, P TikkanenAbstract:Adopted values for the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even–even nuclides are given in Table I. Values of τ, the mean life of the 2+ state; E, the energy; and β, the quadrupole deformation parameter, are also listed there. The ratio of β to the value expected from the single-particle model is presented. The intrinsic quadrupole moment, Q0, is deduced from the B(E2)↑ value. The product E×B(E2)↑ is expressed as a percentage of the energy-weighted total and isoscalar E2 sum-rule strengths. Table II presents the data on which Table I is based, namely the experimental results for B(E2)↑ values with quoted uncertainties. Information is also given on the quantity measured and the method used. The literature has been covered to November 2000. The adopted B(E2)↑ values are compared in Table III with the values given by systematics and by various theoretical models. Predictions of unmeasured B(E2)↑ values are also given in Table III.
G Shaw - One of the best experts on this subject based on the ideXlab platform.
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radionuclide transport above a near surface water Table III soil migration and crop uptake of three gamma emitting radionuclides 1990 to 1993
Journal of Environmental Quality, 2001Co-Authors: P Wadey, G Shaw, J N B BellAbstract:This paper summarizes the vertical distributions of 22 Na, 137 Cs, and 60 Co above controlled water Tables in deep and shallow lysimeters during a four-year experiment. The activity concentration profiles were all determined at the time of harvest of a winter wheat (Triticum aestivum L. cv. Pastiche) crop. Activity concentrations in different crop tissues were determined and crop uptake expressed as both an inventory ratio (IR) and a transfer factor (TF w ), weighted to account for root and radionuclide distributions within the soil profile. Experimental variates were subjected to analysis of variance to determine the single and combined effects of the soil depth and the year of the experiment on the results obtained. Each radionuclide showed significant variations in activity concentration with soil depth, but the significance of these variations from year to year was dependent on radionuclide. A distinction in the behavior of weakly sorbed ( 22 Na) and more highly sorbed ( 137 Cs and 60 Co) radionuclides was observed. The former exhibited significant variations in its distribution in the soil profile from year-to-year whereas the latter did not. Relatively high TF w values for 22 Na were maintained throughout the experiment, whereas for 137 Cs and 60 Co, the highest TF w values were recorded in 1990 followed by a significant decline in 1991, with TF w remaining low in 1992 and 1993. The TF w values were, in general, significantly higher for deep lysimeters than for shallow lysimeters. This is thought to provide evidence of enhanced radionuclide absorption by the relatively small fraction of roots in the vicinity of the deeper water Table.
Stanko Tomić - One of the best experts on this subject based on the ideXlab platform.
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Erratum: Second-order piezoelectricity in wurtzite III-N semiconductors [Phys. Rev. B 84, 085211 (2011)]
Physical Review B, 2011Co-Authors: J. Pal, Geoffrey Tse, V. Haxha, Max A. Migliorato, Stanko TomićAbstract:We note two typographical errors in our recent paper. First, in Table III, the Lw/Lb ratio in the first row should be 3/5, not 3/50. Second, we gave an incorrect sign for some of the parameters listed in Table IV. The parameters of e311, e333, and e133 in Table IV should read as given here. Because the correct signs were used to calculate the fields in the original work, these corrections do not affect our conclusions.