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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

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Initial study of 210Pb in indoor air

¹Environmental Measurements Laboratory, U.S. Department of Energy, New York 10014-3621.

|April 1, 1993

Summary

This study explored measuring indoor lead-210 (210Pb) air concentrations using low flow pumps and membrane filters. Researchers found average indoor 210Pb levels of 150 microBq/m³ and an indoor to outdoor ratio of 0.25.

Area of Science:

Environmental Science
Radiochemistry
Indoor Air Quality

Background:

Lead-210 (210Pb) is a naturally occurring radioactive isotope.
Understanding indoor concentrations of 210Pb is important for assessing potential exposure.
Previous methods for measuring indoor 210Pb concentrations have limitations.

Purpose of the Study:

To determine the feasibility of measuring indoor air concentrations of 210Pb.
To establish a method for collecting and analyzing 210Pb in indoor air.
To quantify indoor 210Pb and 210Po levels and their indoor-to-outdoor ratio.

Main Methods:

Utilized low flow rate pumps and membrane filters for air sampling in an office environment.
Stored air filter samples for 1.6 years.

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Chemically separated and measured 210Po (a decay product of 210Pb) using alpha spectrometry.

Main Results:

Achieved an average indoor air concentration of 150 microBq 210Pb m⁻³.
Measured an average indoor air concentration of 12 microBq 210Po m⁻³.
Estimated the average indoor to outdoor ratio for 210Pb in air to be 0.25.

Conclusions:

The study demonstrated the feasibility of measuring indoor air concentrations of 210Pb.
The developed method allows for the quantification of 210Pb and its progeny in indoor environments.
The findings provide baseline data for indoor 210Pb levels and their relationship to outdoor concentrations.