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Sources for Pu in near surface air.

G Hartmann1, C Thom, K Bächmann

  • 1Fachbereich für Anorganische Chemie und Kernchemie der Technischen Hochschule Darmstadt, Federal Republic of Germany.

Health Physics
|January 1, 1989
PubMed
Summary

Most plutonium (Pu) in near-surface air originates from resuspension, not recent fallout. This study quantifies Pu

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Area of Science:

  • Environmental Science
  • Radiochemistry
  • Atmospheric Science

Background:

  • Plutonium (Pu) presence in near-surface air is a persistent environmental concern.
  • Understanding Pu sources is crucial for assessing exposure risks.
  • Previous studies have focused on direct fallout, but resuspension is increasingly recognized.

Purpose of the Study:

  • To determine the primary source of plutonium in near-surface air.
  • To investigate the vertical and particle size distribution of airborne plutonium.
  • To analyze seasonal variations and the influence of meteorological factors on plutonium levels.

Main Methods:

  • Collection and analysis of near-surface air samples over three years.
  • Measurement of plutonium and other trace elements (Ca, Ti, Fe).
  • Comparison of plutonium behavior with soil-associated elements to infer sources.

Main Results:

  • Plutonium in near-surface air is predominantly from resuspension, similar to elements like Calcium, Titanium, and Iron.
  • Seasonal variations in plutonium levels were observed, influenced by meteorological parameters.
  • Resuspension factor for Pu estimated at 0.8 x 10^-8 m^-1 and resuspension rate at 0.09 x 10^-9 s^-1.

Conclusions:

  • Resuspension of soil-contaminated particles is the main pathway for plutonium entering near-surface air.
  • Plutonium's behavior in air mirrors that of soil-derived elements, supporting the resuspension hypothesis.
  • Quantified resuspension rates provide valuable data for environmental transport models.

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