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RE: Filter Collection Efficiency for Personal Air Monitor
Dr. Raabe,
Thank you for the information.
> -----Original Message-----
> From: Otto G. Raabe [SMTP:ograabe@ucdavis.edu]
> Sent: Wednesday, February 24, 1999 12:56 PM
> To: Multiple recipients of list
> Subject: Re: Filter Collection Efficiency for Personal Air Monitor
>
> February 24, 1999
> Davis, CA
>
> Filter efficiency depends on face velocity (flow rate per unit area) and
> particle size. All filters have a minimum efficiency for particles about
> 0.3 micrometer in physical or aerodynamic diameter. Smaller particle and
> larger particles are more efficiently collected as discussed in Chapter 7
> of INTERNAL RADIATION DOSIMETRY (1994, Medical Physics Publishing Co.
> Madison, WI). This is the reason filter testing usually utilizes only
> particle near 0.3 micrometer in physical diameter.
>
> For some specifics consider the following references:
>
> Lockhart, L.B, Jr., Patterson, R.L., Jr., and Anderson, W.L. (1964).
> Characteristics of Air Filter Media used for Monitoring Airborne
> Radioactivity, NRL Report 6054, U.S. Naval Research Laboratory,
> Washington,
> DC.
>
> Smith, W.J. and Suprenant, N.F. (1953). Properties of Various Filtering
> Media for Atmospheric Dust Sampling, Proceedings of the American Society
> for Testing Materials, 53:1122-1135.
>
> "Sampling aerosols by filtration" in Air Sampling Instruments (1989 or
> more
> recent edition), American Conference of Governmental Industrial
> Hygienists,
> Cincinnati, OH.
>
> Otto
>
>
> *****************************************************
> Prof. Otto G. Raabe, Ph.D., CHP
> Institute of Toxicology & Environmental Health (ITEH)
> (Street address: Old Davis Road)
> University of California, Davis, CA 95616
> Phone: 530-752-7754 FAX: 530-758-6140
> E-mail ograabe@ucdavis.edu
> *****************************************************
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