Subject: Re: dust shutdowns

From: Michael Strauss

Submitted: Fri, 3 Oct 1997 10:45:54 -0400 (EDT)

Message number: 182 (previous: 181, next: 183 up: Index)

>
>2. The lack of correlation between 1 and 0.3 micron dust implies that
>our shut downs appear to be completely ineffective at avoiding small
>dust particles. However, I do not advocate shutting down based on
>counts for 0.3 micron particles, not knowing which particles settle
>down most and are most damaging. But this does illustrate that we may
>not know what we are doing.
>

The .3 micron counts are ignored by the staff. A memo from walt siegmund
received last year stated that the offending particle size regarding
scattered light is 5 micron and above. It was at this time we modified the
particle counter to report the 1 micron  and larger particle counts (the
counter does not have a 5 micron threshold)

Mark Klaene
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