Problems encountered with single-pass column experiments with cohesive material
Creators
- 1. Gesellschaft fuer Strahlen- und Umweltforschung m.b.H. Muenchen, Neuherberg (Germany, F.R.). Inst. fuer Radiohydrometrie
Description
There are three main problems to be solved in experiments with single-pass columns for determining sorption characteristics of radionuclides in cohesive material. In order to maintain the fabric of the cohesive material, the samples should be left as untouched as possible during packing, and the smallest retardation factors and dynamical distribution coefficients are given for authentic packing. When experiments are carried out over a longer period of time it is difficult to keep the flow constant with a given slope. In this case, too, flow fluctuations are kept small by authentic packing. Tritiated water can be used as a tracer for determining the hydrodynamical flow parameters (such as velocity and effective porosity) only after correcting the transport velocity of the tritiated water. (orig.)
Abstract (German)
Bei der Bestimmung der Sorptionsdaten von Radionukliden in bindigen Materialien in Durchlaufsaeulen treten im wesentlichen drei Probleme auf. Um das Gefuege des bindigen Materials zu erhalten, sollte das Material moeglichst ungestoert in die Saeulen eingebaut werden. Fuer ungestoerten Einbau liegen die kleinsten Retardationsfaktoren bzw. dynamischen Verteilungskoeffizienten vor. Schwierigkeiten bereitet das Konstanthalten des Durchflusses bei konstantem Gefaelle ueber laengere Versuchszeiten. Auch hier sind die Durchflussschwankungen am geringsten, wenn das bindige Material ungestoert in die Saeule eingebaut wurde. Tritiiertes Wasser als Tracer zur Bestimmung der hydrodynamischen Stroemungsparameter (Abstandsgeschwindigkeit bzw. effektive Porositaet) eignet sich nur nach Korrektur der Transportgeschwindigkeit des tritiierten Wassers. (orig.)Additional details
Additional titles
- Original title (German)
- Probleme der Durchlaufsaeulen-Versuche mit bindigen Materialien
Publishing Information
- ISBN
- 3-88314-578-5
- Imprint Title
- Chemistry and migration behaviour of the actinides and fission products in natural aquatic systems
- Imprint Pagination
- 341 p.
- Journal Page Range
- p. 173-183.
- Report number
- PTB-SE--14
Conference
- Title
- 66. PTB-seminar 'Chemistry and migration behaviour of the actinides and fission products in natural aquatic systems'.
- Dates
- 24-25 Apr 1986.
- Place
- Garching (Germany, F.R.).
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 18098541
- Subject category
- S54: ENVIRONMENTAL SCIENCES;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ADSORBENTS; ADSORPTION; CESIUM 134; CHROMATOGRAPHY; DESORPTION; HYDRODYNAMICS; MICROSTRUCTURE; POROSITY; SEDIMENTS; STRONTIUM 85; TRACER TECHNIQUES; TRITIUM; WATER
- Descriptors DEC
- BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; CRYSTAL STRUCTURE; DAYS LIVING RADIOISOTOPES; ELECTRON CAPTURE RADIOISOTOPES; EVEN-ODD NUCLEI; FLUID MECHANICS; HOURS LIVING RADIOISOTOPES; HYDROGEN COMPOUNDS; HYDROGEN ISOTOPES; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; ISOMERIC TRANSITION ISOTOPES; ISOTOPE APPLICATIONS; ISOTOPES; LIGHT NUCLEI; MECHANICS; NUCLEI; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; OXYGEN COMPOUNDS; POLAR SOLVENTS; RADIOISOTOPES; SEPARATION PROCESSES; SOLVENTS; STRONTIUM ISOTOPES; YEARS LIVING RADIOISOTOPES
Optional Information
- Notes
- Imprint:Chemie und Migrationsverhalten der Aktinoide und Spaltprodukte in natuerlichen aquatischen Systemen.;Vortraege.