Vertical distribution of radionuclides in soil of a grassland site in Chernobyl exclusion zone

Title: Vertical distribution of radionuclides in soil of a grassland site in Chernobyl exclusion zone

Author: Peter Bossew, Michael Gastberger, Herbert Gohla, Peter Hofer, Alexander Hubmer

Keywords: Chernobyl; Radionuclides; Vertical migration in soil

Abstract: Five soil profiles from a site about 8 km SE of the Chernobyl NPP were investigated for the vertical distribution of radionuclides. The average ¹³⁷Cs-inventory at the site is about 2.6 MBq/m² (reference date 1 May 1986). Apart from ¹³⁷Cs, the following radionuclides have been identified (their activity ratios to ¹³⁷Cs in brackets): ¹³⁴Cs (0.537), ¹²⁵Sb (0.068), ⁶⁰Co (0.0022), ¹⁵⁴Eu (0.016), ¹⁵⁵Eu (0.020), ^94gNb (9.5E-5), ^239/240Pu (0.0088), ²³⁸Pu (0.040), ⁹⁰Sr (0.30) and ²⁴¹Am (0.011). Apparent vertical migration velocities are between 0.14 and 0.26 cm/a, apparent dispersion coefficients range from 0.02 to 0.13 cm²/a. The rankings of the velocities v for different radionuclides are (Sr, Cs, Sb, Co, Pu)<AmD, the following rankings have been found: (Nb, Sr, Cs)<Am<Eu, Csp=0.1 level).

URL: http://www.sciencedirect.com/science/article/pii/S0265931X03002364

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