Radiation biology. Radioecology
ISSN: 0869-8031

Archives → 2021 → V. 61. № 5 → pp. 543-554

Article

Influence of calcium chloride on vertical migration of ⁹⁰Sr in gray forest soil

Grakovsky V.G., Frid A.S.

Soil Institute V.V. Dokuchaev, Moscow, Russia

Abstract

Vertical migration of ⁹⁰Sr was studied in forest landscape (region of EURT) on gray forest soil in condition of application of different doses of CaCl₂ on the soil surface. It was found that the dependence of ⁹⁰Sr penetration depth along the soil profile on the duration of migration and salt application rates is ambiguous. Dependences of parameters of three dynamical models on the duration of migration and salt application rates are ambiguous Nevertheless, gradual fixation of ⁹⁰Sr and consequent migration slowing down over time are most likely. The range of medians estimates of diffusion parameters in three migration models for all doses of salt was (6.5–115) × 10^–8 cm²/s for 5 year term after salt application (8 year term after contamination) и (1.7–145) × 10^–8 cm²/s for 9 year term after salt application (12 year term after contamination). The range of medians estimates of fixation parameters was of (3.5–15) × 10^–9 1/s (0.11–0.47 1/yr) and (5.5–7) × 10^–9 1/s (0.17–0.22 1/yr) for 5 and 7 years respectively. Estimates of traditionally applied distribution coefficients for the content of water-soluble ⁹⁰Sr (the ratio of the exchangeable form to the content in the soil solution) become overestimated in condition of noticeable fixation.

Keywords

Vertical migration in soil, Gray Forest soil, EURT, application of CaCl2, parameters of migration dynamical models, ⁹⁰Sr fixation, water-soluble ⁹⁰Sr