Results 141 to 150 of about 806 (167)

Parameters inversion of nuclide migration based on accelerating genetic algorithm

2011 International Symposium on Water Resource and Environmental Protection, 2011
Aiming at the need for model parameters of numerical simulation of nuclide migration at a nuclear waste filed, making use of the observation data of nuclide concentration, taking important parameters like hydraulic conductivity and dispersity for inversion parameters, based on real-coded accelerating genetic algorithm, parameters inversion model of ...
Wenke Wang, Feng Han
exaly   +2 more sources

Numerical Analysis of Nuclide Migration Through Fissured Geological Media

Nuclear Technology, 1984
A computational analysis of nuclide migration through fissured geological formations was performed. The migration behavior can be described by convective transport in the fissures, diffusive transport with radioactive decay chain in the bulk rock, and sorption on the fissure wall.
Joonhong Ahn, Atsuyuki Suzuki, Ryohei Kiyose   +2 more
exaly   +2 more sources

Measurements of Parameters Essential to Predicting Nuclide Migration

1979
In order to understand the migration of radionuclides in the environment characteristic for proposed geological repositories it is necessary to identify and measure the parameters that reflect the basic mechanisms of mobility and retention of the migrating species.
S. Fried, A. Friedman, F. Schreiner, R. Sjoblom, J. Hines, R. Strickert, P. Rickert   +6 more
exaly   +2 more sources

Investigation of nuclide migration in complex fractures with filling properties

Journal of Cleaner Production, 2023
Yun Chen, Guowei Ma, Huidong Wang
exaly   +2 more sources

Nuclide migration under non-equilibrium sorption in a rock matrix surrounding a repository

Annals of Nuclear Energy, 1984
Abstract A theoretical analysis of the migration of nuclides leaching out of a repository is presented. The analysis is applicable to a situation where the sorption process can be described by a first-order reversible reaction model. By means of a parametric study the effects of adsorption and desorption rate constants, groundwater velocity and ...
A.K. Ray, S. Nair
exaly   +2 more sources

Role of Microscopic Flow-Paths on Nuclide Migration in Sedimentary Rocks

Radiochimica Acta, 1994
H. Yoshida, K. Kodama, K. Ota
exaly   +4 more sources

Nuclide migration and the environmental radiochemistry of Florida phosphogypsum

Journal of Environmental Radioactivity, 2001
Phosphogypsum, a waste by-product derived from the wet process production of phosphoric acid, represents one of the most serious problems facing the phosphate industry in Florida today. This by-product gypsum precipitates during the reaction of sulfuric acid with phosphate rock and is stored at a rate of about 40 million tons per year on several stacks
W C, Burnett, A W, Elzerman
openaire   +2 more sources

Simulation of the underground migration of nuclides from radioactive wastes

Computers & Chemistry, 1997
Abstract A model study of the underground migration of 144Ce(III) from radioactive wastes in an homogeneous environment (clinoptilolit) has been undertaken and compared with an earlier one treating the dispersion of 239Pu(II) in clay. For this purpose pertinent software has been developed. The adsorption capacity and the distribution coefficients for
Georgi P. Vassilev, Christo T. Daiev
openaire   +1 more source

Significance of the Effect of Mineral Alteration on Nuclide Migration

MRS Proceedings, 1993
ABSTRACTIn order to clarify the effect of mineral alteration on nuclide migration, we examined the processes, mechanisms, and kinetics of chlorite weathering, and the uranium concentrations in minerals and rocks at Koongarra, Australia. The observed concentrations of uranium in rocks were compared to those calculated.
Takashi Murakami, Toshihiko Ohnuki, Hiroshi Isobe, Tsutomu Sato, Nobuyuki Yanase, Hideo Kimura   +5 more
openaire   +1 more source

Migration Behavior of Uranium Series Nuclides in Altered Quartz-Chlorite Schist

MRS Proceedings, 1989
ABSTRACTThe migration behavior of uranium series nuclides in an altered quartz-chlorite schist has been studied by utilizing data on the activity distributions of uranium series nuclides at Koongarra in the Northern Territory of Australia. The variation of 230Th/234U activity ratios (ARs) with distance along surface (2 m depth), intermediate (16 m) and
T. Ohnuki, T. Murakami, K. Sekine, N. Yanase, H. Isobe, Y. Kobayashi   +5 more
openaire   +1 more source