Field study of the migration of 90Sr, 237Np, 238Pu and 241Am in unsaturated Chinese loess under artificial rainfall condition
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S. S. Li
Summary
The migration of 90Sr, 237Np, 238Pu and 241Am in unsaturated Chinese loess under artificial rainfall condition was investigated at the CIRP´s field test site. Quartz containing 90Sr, 237Np, 238Pu and 241Am was introduced into an experimental pit and the pit was backfilled. Artificial rainfall of 10-15 mm/d was applied to the experimental pit for 1078 days. HTO was used for obtaining the migration rate of moisture water in the pit. Vertical core soil samples were taken twice a year and cut into 0.5cm long section soil samples. The section soil samples were weighed and wind dried. Radioactivity of 237Np and 241Am in the section soil samples was measured with a low energy photon detector (HPGe); 90Sr and 238Pu were determined with a low background α & β detector after chemical separation. During the experiment, moisture water at different depths was taken on a daily basis and 3H in the moisture water samples was determined with liquid scintillation technique. Experimental result indicates that the downward migration rate of moisture water was 2.27 cm/d and the retardation factors of 90Sr, 237Np, 238Pu and 241Am in the loess unsaturated zone were 9.9 × 102, 3.2 × 103, 3.2 × 103 and 4.5 × 103, respectively. This result suggests that 90Sr, 237Np, 238Pu and 241Am could be effectively retarded by the loess unsaturated zone.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- Measurement of cross sections of threshold detectors with spectrum average technique
- Ionic radii of heavy actinide(III) cations
- Effect of the chemical state of uranium atom on the energy of spin-orbital splitting of its inner orbitals
- Heterogeneous catalytic redox reactions of neptunium ions in the aqueous system HNO3-HCOOH
- Field study of the migration of 90Sr, 237Np, 238Pu and 241Am in unsaturated Chinese loess under artificial rainfall condition
- Extraction of tetravalent neptunium isoxazolonates as their TOPO adducts
- Extraction of Eu(III) and Tm(III) with picrolonic acid in methylisobutylketone
- Adsorption of 60Co2+ on hydrous manganese oxide powder from aqueous solution
- Simultaneous multi-element determination in some cosmetic samples of different origins using neutron activation analysis
- Radiolysis of an aqueous [11C]iomazenil solution
