Fallout traces of the Fukushima NPP accident in southern West Siberia (Novosibirsk, Russia).

Background: The fallout of artificially produced radioactive isotopes has been recorded at a site in southern West Siberia (54°50'43.6″ N, 083°06'22.4″ E, Novosibirsk, Russia).

Accumulation of 242Pu by a macrophyte of the Yenisei River (Elodea canadensis) in laboratory experiments.

The study addresses 242Pu accumulation by Elodea canadensis, one of the abundant species of submerged plants in the Yenisei River. 242Pu in water samples of the "Elodea-Yenisei River water" model system and in the biomass fractions was determined alpha-spectrometrically, following radiochemical recovery of 242Pu using 236Pu--a chemical yield tracer. The experiments on accumulation of 242Pu by Elodea biomass showed that the activity concentration of 242Pu can reach 21 +/- 2 Bq/g dry wt, with the concentration factor for 242Pu 13100 +/- 2100 L/kg dry wt.

Disequilibrium between uranium and its progeny in the Lake Issyk-Kul system (Kyrgyzstan) under a combined effect of natural and manmade processes.

The Kadji-Sai abandoned field of U-bearing brown coal on the southern coast of Lake Issyk-Kul (Kyrgyzstan) poses a threat of radioactive pollution to the world's fifth deepest and second largest pristine highland lake. The valleys of ephemeral streams in the lake catchment are filled with coarse-grained sand and clay, with a background U--Ra activity of 35--55 Bqkg(-1). High activity areas vs.