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A nuclear mass spectrometer for studying radon progeny clusters

S L Gong1, C R Phillips, R E Jervis

  • 1Department of Chemical Engineering and Applied Chemistry, University of Toronto, Ontario, Canada.

Health Physics
|November 1, 1996
PubMed
Summary

A novel Nuclear Mass Spectrometer detected radon progeny clusters in water vapor and sulfur dioxide environments. This system identified specific cluster compositions, advancing our understanding of atmospheric particle formation.

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Area of Science:

  • Environmental Science
  • Nuclear Chemistry
  • Atmospheric Chemistry

Background:

  • Radon progeny, such as 218Po, can form clusters in the atmosphere.
  • Understanding cluster formation is crucial for aerosol science and health risk assessment.

Purpose of the Study:

  • To develop and utilize a Nuclear Mass Spectrometer (NMS) for investigating radon progeny cluster formation.
  • To analyze cluster composition in gaseous H2O and H2O-SO2 environments at the molecular level.

Main Methods:

  • Development of a Nuclear Mass Spectrometer (NMS) combining mass spectrometry and alpha particle detection.
  • Experimental observation of radon progeny (218Po) clusters in controlled gaseous environments.

Main Results:

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  • Observed 218Po+(H2O)n clusters (n=1-7) at 0.1% relative humidity, with n=4 being most abundant.
  • Detected 218Po+(H2O)n(H2SO4)m clusters (n=0-4, m=0-3) upon SO2 addition, a first-time observation.
  • Identified maximum cluster distribution corresponding to specific compositions like 218Po+(H2SO4)2.

    • Conclusions:

    • The NMS system successfully detected and characterized individual radon progeny cluster ions.
    • Sulfur dioxide significantly influences radon progeny cluster formation, leading to new mixed cluster types.
    • Findings provide molecular-level insights into atmospheric aerosol nucleation and growth processes.