Discharge of negatively charged micrometer size particles in an electrodynamic balance due to radioactivity

Discharge of negatively charged micrometer size particles in an electrodynamic balance due to radioactivity

The radiation dose rate of the combined natural sources of both cosmic rays and terrestrial radioactivity was measured from the discharge of a negatively charged 10.2 μ m diameter polystyrene particle levitated in an electrodynamic balance, giving good agreement with the predicted natural dose. This...

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Bibliographic Details
Published in:Journal of aerosol science Vol. 36; no. 8; pp. 1023 - 1035
Main Authors: Jarzembski, Maurice A., Tankosic, Dragana V.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01-08-2005
Elsevier Science
Subjects:
Aerosols
Chemistry
Colloidal state and disperse state
Cosmic rays
Electrodynamic balance
Exact sciences and technology
Gamma radioactivity
General and physical chemistry
Micrometer size particle
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Terrestrial radioactivity
Gamma radioactivity
Terrestrial radioactivity
Micrometer size particle
Electrodynamic balance
Cosmic rays
Electrodynamics
Particle size
Charged particle
Cosmic ray
Radioactivity
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Summary:The radiation dose rate of the combined natural sources of both cosmic rays and terrestrial radioactivity was measured from the discharge of a negatively charged 10.2 μ m diameter polystyrene particle levitated in an electrodynamic balance, giving good agreement with the predicted natural dose. This measurement was based upon a series of discharge experiments of these particles due to the influence of a cesium 137 gamma ray radioactive source for various cases of amplitude V ac (800–2000 V) and frequency f (200–700 Hz) of the alternating potential applied to the balance's ring electrode, covering a full range of possible operating V ac and f values for the balance. These set of measurements revealed an interesting complex behavior of discharge rates. Effects of the initial amount of charge on the particle and the density of gamma rays were also studied as well. A least squares logarithmic second order equation was fitted to these measured discharge data, which easily offered a method of measuring the activity of the natural sources at V ac = 800 V and f = 700 Hz .
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0021-8502
1879-1964
DOI:10.1016/j.jaerosci.2004.10.016