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The migration of  99 Tc in unsaturated Chinese loess under artificial rainfall condition was investigated  in situ . Water suckers were buried at different depths under the bottom of an experimental pit of 2 m × 2 m × 1 m (deep). Quartz containing  3 H and  99 Tc was introduced into the experimental pit to an area of 40 cm × 40 cm and the pit was backfilled to a thickness of 30 cm. An artificial rainfall of 5 mm/h was applied to the experimental pit 4 h a day for 3 months. Moisture water samples were sucked with the help of a vacuum pumping system and the activity of  3 H and  99 Tc in the samples was determined. Breakthrough curves of  3 H and  99 Tc indicated that  99 Tc was slightly retarded. The calculated average apparent distribution coefficient of  99 Tc in the medium was (1.98±0.42)×10 -2  ml/g.

Migration of 99 Tc in unsaturated Chinese loess under artificial rainfall condition: an in situ test