The iSolo was designed around the Versapore filter, but as Tom VanderMey noted,
works great with the PTFE filter (what we use). Eichrom did a study a few
years ago that documents this. You really don't want to use a standard
glass-fiber filter as the self-absorption & attendant spectrum tailing is more
than the algorithm is designed for.
No matter what instrument you use, I recommend a hard-surface filter (e.g. PTFE
or Versapore) for areas where alpha is a significant concern. We use the PTFE
for all air samples and lapel samples where the flow rate is <= 4 cfm. We
found we could not get much more than that without overheating our samplers.
Given all that the iSolo can, with decent accuracy, discern around 1 DAC
transuranic in the presence of 10 DAC radon within an hour of pulling the
filter from the sampler. This gets much better as time progresses. We've
found that at about four hours it is very close to the final decay count (72+
hours).
I've found the iSolo to be a very handy device to let us know if we are having
a bad day or not.
On a related note: Anyone out there using annular kinetic impactors?
David Brehm
Radiological Engineer
Office: 402.533.7582
Radiation Protection - Nuclear Operations
Cellular: 402.237-9840
Omaha Public Power District - Fort Calhoun Nuclear Station
Pager: 402.561.3310
9610 Power Lane, Blair, NE 68008
[email protected]<mailto:[email protected]>
"But the most amazing thing of all: I get paid for doing this" (Steve Martin,
late 70's)
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Wednesday, October 01, 2014 4:30 PM
To: [email protected]
Subject: Powernet: Canberra iSolo
I am preparing to put the Canberra iSolo through its paces during an upcoming
outage on an alpha-heavy unit. It's main selling point for Palo Verde was the
radon rejection algorithm.
Do any of you have experience with the iSolo at your facilities?
Heather Jackson
Sr. Health Physicist
Palo Verde Nuclear Power Plant
623-393-6076
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