The attached files show pulse height spectra obtained with an 55Fe
source using DME in the new PPP chamber.  Two different cylinders of gas
were tested, the "large" DME cylinder which had no detectable freon
contamination with GC ECD analysis, and the "new small" cylinder which
had a 25 ppb freon 12 contaminant by GC ECD.  In addition tests were
done with/without our $1500 filters, different flow rates, and with the
source moved closer and farther away from the chamber.
    The difference between the PPP spectra and the previous SWC ageing
test chamber spectra is significant, there do not appear to be major
differences between the various conditions tried with the PPP.

DM02CEN.EPS - typical spectra from previous tests with the SWC ageing
test chambers.

RHEND1.EPS - "large" DME cylinder, source close, flow ~ 100
cc/min/chmbr, both filters inline.   (flow left at 100 cc/min/chmbr for
all "large" cyl tests).

RHEND2.EPS - "large" DME cylinder,  no filters

RHEND3.EPS - "large" DME cylinder, no filters, source backed off.  (to
make sure we're illuminating entire cell).  (Source left in this
position for all following tests).

RHEND4.EPS - "new small" DME cylinder, no filters, 100 cc/min/chmbr

RHEND5.EPS - "new small" DME cylinder, no filters, flow reduced to ~ 20
cc/min/chmbr.

RHEND6.EPS - "new small" DME cylinder, both filters inline, flow 100
cc/min/chmbr.

Filename: dm02cen.eps

Filename: rhend1.eps

Filename: rhend2.eps

Filename: rhend3.eps

Filename: rhend4.eps

Filename: rhend5.eps

Filename: rhend6.eps

Created for the The Center for Subatomic Research E614 Project Projects Page.

Created by The CoCoBoard.