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Correcting for H2O interference using a RAD7 electrostatic collection-based silicon detector.

G De Simone1, C Lucchetti1, G Galli2

  • 1Università "Roma Tre", Dipartimento di Scienze, Largo San Leonardo Murialdo 1, 00146 Roma, Italy.

Journal of Environmental Radioactivity
|June 3, 2016
PubMed
Summary
This summary is machine-generated.

Water molecules negatively impact electrostatic collection of polonium-218 ions on silicon detectors, reducing their efficiency. Temperature has no effect, but corrections can adjust radon readings influenced by humidity.

Keywords:
(218)Po neutralization by water vaporNAPL contaminationRAD7Scintillation cellSoil radon

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Area of Science:

  • Environmental Science
  • Nuclear Physics
  • Analytical Chemistry

Background:

  • Radon monitoring is crucial for assessing environmental and health risks.
  • Silicon detectors are used for electrostatic collection of polonium ions, but their efficiency can be affected by environmental factors.
  • Understanding the influence of water molecules on ion collection is essential for accurate radon measurements.

Purpose of the Study:

  • To investigate the effect of water molecules on the electrostatic collection efficiency of polonium-218 ions onto silicon detectors.
  • To compare the performance of silicon detectors with a humidity-insensitive scintillation cell under varying humidity conditions.
  • To develop correction factors for soil radon readings affected by humidity and desiccant use.

Main Methods:

  • Utilized a radon monitor (RAD7) connected to a stainless steel chamber with both a silicon detector and a ZnS scintillation cell.
  • Manipulated water molecule concentration in the chamber by using desiccants or bubbling water.
  • Measured the relative efficiency of the silicon detector against the scintillation cell across a range of water content (0.00075 to 0.014 g).

Main Results:

  • Silicon detector efficiency decreased with increasing water molecules, indicating a negative impact of humidity.
  • The humidity effect was more pronounced during humidification than drying, attributed to cluster formation of polonium ions.
  • Temperature (18.5-35.6 °C) did not significantly affect detector efficiency.
  • A humidity-dependent error range of 1.8% to 7.5% was observed.

Conclusions:

  • Water molecules significantly impair the electrostatic collection efficiency of silicon detectors for polonium-218 ions.
  • Developed correction factors are necessary for accurate soil radon measurements, especially after desiccant removal following potential Non-Aqueous Phase Liquids (NAPLs) leakage.
  • The findings are critical for improving the reliability of radon detection systems in diverse environmental conditions.