Radiocesium distribution and mid-term dynamics in the ponds of the Fukushima Dai-ichi nuclear power plant exclusion zone in 2015-2019.

This study analyzes the Cs behavior in the ponds of Okuma Town from 2015 to 2019 in the Fukushima Dai-ichi nuclear power plant (FDNPP) exclusion zone. A decline in both particulate and dissolved Cs activity concentrations was revealed. The decline rate constants for the particulate Cs activity concentration were found to be higher than for the dissolved Cs activity concentration.

Detailed study of post-Chernobyl Cs-137 redistribution in the soils of a small agricultural catchment (Tula region, Russia).

A detailed study of Cs redistribution was conducted within a small agricultural catchment in the highly contaminated Plavsk radioactive hotspot in the Tula region of Central Russia, 32 years after the Chernobyl nuclear power plant (NPP) accident, which occurred on April 26, 1986. Although more than three decades have passed since the Chernobyl NPP incident, Cs contamination is high. The Cs inventory varies from 67 to 306 kBq·m, which is 2-6 times higher than the radiation safety standard; however, the soils remain suitable for crop cultivation.

Use of natural and artificial radionuclides to determine the sedimentation rates in two North Caucasus lakes.

The specific activities of natural (Pb, Ra, and Th) and artificial (Cs, Pu, and Am) radionuclides in the sediments of two North Caucasus lakes were determined. The two lakes, Lake Khuko and Lake Donguz-Orun, differ in their sedimentation conditions. Based on the use of unsupported Pb and both Chernobyl-derived and bomb-derived Cs as chronological markers, it was established that the sedimentation rates in Lake Khuko over the past 55-60 y did not exceed 0.