Chromatographic generator systems for the actinides and natural decay series elements

2011 ◽  
Vol 99 (3) ◽  
pp. 151-159 ◽  
Author(s):  
Daniel R. McAlister ◽  
E. Philip Horwitz
Keyword(s):  
Decay Series ◽  
Natural Decay

Radioactive ingrowth in a natural decay series. A demonstration

1990 ◽  
Vol 67 (5) ◽  
pp. 374
Author(s):  
K. Murray Matthews ◽  
Rachael M. Larkin
Keyword(s):  
Decay Series ◽  
Natural Decay

DECSERVIS-2: A tool for natural decay series mass flow simulation

2009 ◽  
Vol 67 (11) ◽  
pp. 1992-1997 ◽  
Author(s):  
Saad Azzam ◽  
Juhani Suksi ◽  
Michael Ammann
Keyword(s):  
Mass Flow ◽  
Flow Simulation ◽  
Decay Series ◽  
Natural Decay

An Analogue Validation Study of Natural Radionuclide Migration in Crystalline Rocks using Uranium-Series Disequilibrium Studies

1985 ◽  
Vol 50 ◽  
Author(s):  
J. A. T. Smellie ◽  
A. B. MacKenzie ◽  
R. D. Scott
Keyword(s):  
Natural Radionuclide ◽  
Hydrothermal Activity ◽  
Crystalline Rock ◽  
Crystalline Rocks ◽  
Radionuclide Migration ◽  
Uranium Series ◽  
Saturated Rock ◽  
Decay Series ◽  
Uranium Migration ◽  
Natural Decay

AbstractConcentrations and isotope ratios of natural decay series radionuclides have been studied in three contrasting crystalline rock drillcore sections intersecting water-conducting fractures deep in the bedrock. Radioactive disequilibria resulting from rock-water interactions were observed in two of the cores. These indicated uranium migration along distances of 40 cm or more on a timescale of 106 years in conjunction with thorium immobility under the same conditions. Fracture surface minerals showed a high affinity for radionuclide retardation and a limit of about 3 cm is suggested for the migration of radionuclides from fracture fluids into the saturated rock. This limit may correspond to enhanced matrix porosities resulting from earlier hydrothermal activity along the same channels.

scholarly journals Reaction of bentonite in low-alkali cement leachates: an overview of the Cyprus Natural Analogue Project (CNAP)

2012 ◽  
Vol 76 (8) ◽  
pp. 3019-3022 ◽  
Author(s):  
W. R. Alexander ◽  
A. E. Milodowski ◽  
A. F. Pitty ◽  
S. M. L. Hardie ◽  
S. J. Kemp ◽  
...  
Keyword(s):  
Critical Path ◽  
Series Data ◽  
Reaction Products ◽  
Natural Analogue ◽  
Rock Interaction ◽  
Analogue Study ◽  
Bentonite Buffer ◽  
Slow Kinetics ◽  
Decay Series ◽  
Natural Decay

AbstractThe Cyprus Natural Analogue Project was carried out due to the requirement to support ongoing laboratory and modelling efforts on the potential reaction of the bentonite buffer with cementitious leachates in the repository engineered barrier system. Although it is known that the higher pH (12.5–13) leachates from ordinary Portland cement will degrade bentonite, it is unclear if this will also be the case for the lower pH (10–11) leachates typical of low alkali cements. Ongoing laboratory and underground rock laboratory programmes, which are currently investigating this, face the obstacle of slow kinetics and the production of short-lived metastable phases, meaning obtaining unambiguous results may take decades. It was therefore decided to implement a focussed natural analogue study on bentonite/low alkali cement leachate reactions to provide indications of the probable long-term reaction products and reaction pathways to provide feedback on the existing short-term investigations noted above and to ascertain if any critical path research and development needs to be instigated now. The results of the analyses presented here, in this short overview of the project, suggest that there has been very limited alkaline groundwater reaction with the bentonite. This is generally supported by both the geomorphological evidence and the natural decay series data which imply groundwater/rock interaction in the last 105 a.

Natural decay series radionuclides in and around a large metal refinery

1996 ◽  
Vol 32 (1-2) ◽  
pp. 115-133 ◽  
Author(s):  
M.S. Baxter ◽  
A.B. MacKenzie ◽  
B.W. East ◽  
E.M. Scott
Keyword(s):  
Decay Series ◽  
Natural Decay

scholarly journals DECSERVIS: a tool for radioactive decay series visualisation

2006 ◽  
Vol 4 (4) ◽  
pp. 822-834 ◽  
Author(s):  
Saad Azzam ◽  
Juhani Suksi
Keyword(s):  
Initial Conditions ◽  
Radioactive Decay ◽  
Decay Chain ◽  
Decay Series ◽  
Closed Systems ◽  
Natural Decay ◽  
User Friendly ◽  
Interactive Visualisation ◽  
Flexible Operation ◽  
Chain Decay

AbstractWe have developed an interactive visualisation tool, decay series visualisation (DECSERVIS), for exploring the three natural radioactive decay chains. Through DECSERVIS, one can investigate the full decay scheme of any natural decay chain radionuclide to obtain the number of nuclides, their masses, activities, and activity ratios, accounting for all the daughters, starting from initial conditions freely chosen by the user. The tool has been developed particularly for user friendly and flexible operation. Chain decay in closed systems can be explored as a function of time with various graphical presentations such as solid curve and column diagrams or animation. We present several exploration examples related to geological dating. DECSERVIS will be freely available on request.

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