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Related Experiment Videos

Long-term decrease of atmospheric test 137Cs in the soil-prairie plant-milk pathway in southern Chile

P Schuller1, J Handl, A Ellies

  • 1Universidad Austral de Chile, Valdivia.

Health Physics
|June 30, 1998
PubMed
Summary

Cesium-137 (137Cs) levels in soil decreased steadily, but its uptake by plants and transfer to milk slowed over time in Chilean pastures. This indicates reduced 137Cs availability in soil impacting the food chain.

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[Not Available].

Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al]·2016

Area of Science:

  • Environmental Science
  • Radiochemistry
  • Agricultural Science

Background:

  • Nuclear testing released Cesium-137 (137Cs), a long-lived radionuclide, into the environment.
  • Understanding 137Cs dynamics in soil-plant-milk systems is crucial for food safety and ecological monitoring.

Purpose of the Study:

  • To investigate the time-dependent behavior of 137Cs in soil, prairie plants, and milk.
  • To analyze the effective half-lives of 137Cs concentration changes in these matrices.
  • To assess the long-term trends in 137Cs plant uptake and transfer to milk.

Main Methods:

  • Long-term monitoring of 137Cs concentrations in soil, prairie plants, and milk from 1982 to 1997.
  • Analysis of 137Cs concentration trends and calculation of effective half-lives for different periods.

Related Experiment Videos

  • Assessment of 137Cs availability in Hapludand soils.

    • Main Results:

    • Soil 137Cs concentration decreased at a rate near its physical decay.
    • 137Cs concentration in plants and milk showed a rapid decrease from 1982-1990, followed by a slower decrease from 1991-1997.
    • Effective half-lives for 137Cs in plants were 5.6 y and 12 y; in milk, 5.5 y and 13 y for the two periods, respectively.

    Conclusions:

    • A reduction in the rate of decrease of 137Cs plant uptake was observed.
    • The decline in 137Cs concentration in milk was consequently reduced.
    • Decreased 137Cs availability in Hapludand soils contributed to these observed trends over the 15-year period.