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SEISMIC PREDICTION USING UNATTACHED RADON DECAY PRODUCTS.

Naomi H Harley1, Passaporn Chittaporn1, Isabel M Fisenne2

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Summary
This summary is machine-generated.

Radon-222 (222Rn) concentrations and decay products were measured using lead-210 (210Pb) as a tracer. Real-time measurements of unattached polonium-218 (218Po) may detect radon flow linked to seismic activity.

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Area of Science:

  • Environmental Science
  • Radiochemistry
  • Atmospheric Physics

Background:

  • Long-term monitoring of radon-222 (222Rn) and its decay products is crucial for understanding indoor and outdoor air quality.
  • Lead-210 (210Pb) serves as a useful long-lived tracer for studying radon progeny dynamics and particle transport.

Purpose of the Study:

  • To investigate the concentration, activity, and particle size distribution of 222Rn decay products at diverse locations.
  • To assess the utility of unattached 218Po as a real-time indicator of 222Rn fluctuations, particularly those driven by pressure changes.

Main Methods:

  • Utilized long-term measurements of 222Rn concentration, decay product activity, and particle size distribution.
  • Employed 210Pb as a tracer for radon decay products and airborne 210Pb.
  • Conducted measurements at a suburban home and near 226Ra storage silos at a former uranium processing facility.

Main Results:

  • Unattached fractions of radon decay products (2-4 nm diameter) were 1.5% at the home and 14% at the silos.
  • Detected pressure-driven 222Rn flow at the silo location, enhanced by filtered air measurements.
  • The unattached fraction of polonium-218 (218Po) correlated with 222Rn concentration.

Conclusions:

  • Real-time measurement of unattached 218Po can provide immediate insights into 222Rn concentration changes.
  • This method shows potential for identifying rapid 222Rn variations linked to pressure-driven soil air flow, potentially associated with seismic events.