Radiation-Induced Particulate Agglomeration Feasibility Study.
Rept. for 31 Mar 77-31 Mar 78 on Phase 1,
PANAMETRICS INC WALTHAM MASS
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The removal of aerosol particles from a gas by standard gas filtration techniques is more difficult for submicron particles than for larger particles. Filtration methods presently in use can achieve high efficiencies of submicron particle removal by use of high-efficiency HEPA filters. The system investigated is intended to agglomerate fine particles into larger sizes so that they are more easily captured by inexpensive low-efficiency prefilters used ahead of the more expensive HEPA filters. The basic concept involves use of a beta radiation source to generate an intense volume of ionization. Application of an electric field to plates enclosing this volume then produces separate regions of positive and negative ions through which the particulate-containing air passes. After leaving this charging stage the oppositely-charged particulate distributions enter an agglomeration stage in which the polarity on the enclosing plates is reversed, so that particles of opposite sign are brought into close proximity, hence producing agglomeration and shifting the particle distribution toward larger sizes. With 20 kV on the plates, the charging times can be on the order of one second or less.
- Nuclear Physics and Elementary Particle Physics