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Weathering of fallout.

Science (New York, N.Y.)

|May 8, 1959

Summary

Nuclear fallout pellets were weathered using electrodialysis. Strontium-90 (Sr(90)) activity release varied based on fallout collection method and distance from the nuclear test site.

Area of Science:

Environmental Science
Nuclear Chemistry
Radioactive Contamination

Background:

Nuclear explosions generate radioactive fallout, posing environmental risks.
Understanding the release dynamics of specific radionuclides, like Strontium-90 (Sr(90)), from fallout is crucial for assessing contamination.
Weathering processes can alter the mobility and bioavailability of radionuclides in fallout particles.

Purpose of the Study:

To investigate the release of total beta activity and Strontium-90 (Sr(90)) from nuclear fallout particles under simulated weathering conditions.
To determine how collection location and method influence the release rate of Sr(90) from fallout.

Main Methods:

Fallout pellets collected near ground zero were subjected to electrodialysis to assess total beta activity release.

Keywords:

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Airborne and aircraft-collected fallout samples were analyzed for Sr(90) release after weathering.

Sr(90) release was quantified based on fallout collection distance (612 miles) and type of nuclear test (tower vs. balloon shot).

Main Results:

Electrodialysis weathering released trace amounts of total beta activity from fallout pellets near ground zero.
Airborne fallout collected 612 miles away released 51.8% of its Sr(90) activity.
Aircraft-collected fallout showed varied Sr(90) release: 40.5% from a tower shot and 86% from a balloon shot.

Conclusions:

The weathering process, simulated by electrodialysis, can mobilize radionuclides from nuclear fallout.
The distance from the nuclear test site and the method of fallout collection significantly impact the release of Strontium-90.
Findings highlight the importance of considering fallout characteristics and environmental interactions for accurate radiological assessments.