Aerosol Charge Neutralization by a Radioactive Alpha Source

Benjamin Y H Liu, David Y H Pui, Bing Y. Lin

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The performance of a Po‐210 radioactive ionizer for aerosol charge neutralization and bipolar charging has been evaluated. Monodisperse neutral and singly charged aerosols have been passed through the ionizer and their approach to the steady‐state Boltzmann charge measured by measuring the fraction of particles that are electrically charged. The result shows that an Nt of approximately 2.5 × 105 cm−3 s is needed for the development of a steady‐state charge fraction equal to that given by the Boltzmann' s law where N is the ion concentration and t is the residence time of the aerosol in the neutralizer. In addition, the performance of the ionizer for particle charge neutralization in a vibrating‐orifice aerosol generator has been evaluated and the result shows that the source is less effective for this application and the residual charge on the particles is considerably higher than that given by the Boltzmann's law.

Original languageEnglish (US)
Pages (from-to)111-116
Number of pages6
JournalParticle Characterization
Issue number3
StatePublished - 1986


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