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Americium behaviour in plastic vessels.

F Legarda¹, M Herranz, R Idoeta

¹Departamento de Ingeniería Nuclear y Mecánica de Fluidos, Escuela Técnica Superior de Ingeniería de Bilbao, Universidad del País Vasco (UPV/EHU), Bilbao, Spain.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|January 1, 2010

Summary

Researchers studied Americium-241 (241Am) adsorption in plastic containers. Adsorption was minimized using PET or PVC plastics, no agitation, and acidic conditions, crucial for managing radioactive materials.

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Area of Science:

Environmental Science
Radiochemistry
Materials Science

Background:

Understanding the behavior of radioactive isotopes like Americium-241 (241Am) in storage is critical for nuclear waste management and environmental safety.
Plastic materials are commonly used for storing aqueous solutions, but their interaction with dissolved radionuclides is not fully characterized.

Purpose of the Study:

To quantify the adsorption of Americium-241 (241Am) onto different plastic storage vessels.
To investigate the influence of water type, plastic type, agitation, surface-to-volume ratio, and pH on 241Am retention.

Main Methods:

Investigated 241Am adsorption in water using three distinct plastic types (PET, PVC, and another unspecified).
Varied experimental conditions including water source (natural vs. distilled), vessel agitation (time and speed), surface-to-volume ratio, and water pH.
Measured adsorption percentages ranging from 0% to 70%.

Main Results:

Americium-241 adsorption varied significantly across different plastics and conditions, ranging from 0% to 70%.
Minimal adsorption was observed with Polyethylene terephthalate (PET) and Polyvinyl chloride (PVC) plastics.
Adsorption was significantly reduced under conditions of no water agitation and water acidification.

Conclusions:

The choice of plastic material and storage conditions significantly impacts 241Am retention in aqueous solutions.
PET and PVC plastics, coupled with static (no agitation) and acidic conditions, are recommended for minimizing 241Am adsorption.
These findings are vital for optimizing the safe storage of radioactive materials and preventing environmental contamination.