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RE: Ac-227 electroplated disk source
A few things about Ac-227:
1. The most abundant alpha is less than 1% not very good for alpha
calibration
2. ingrowth would render this source useless in less than six months IF you
could get a pure Ac-227 source
3. Unless you use very short count times during calibration you will
experience detector contamination from Rn-219 decay products
You might have better luck with Pa-231 to detect Actinides. Better yet use
U-235. That is what you are really after.
Charlie Migliore
-----Original Message-----
From: owner-radsafe@list.vanderbilt.edu
[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of yong zhu
Sent: Tuesday, June 11, 2002 3:03 PM
To: JGinniver@AOL.COM
Cc: radsafe@list.vanderbilt.edu
Subject: Re: Ac-227 electroplated disk source
Hi, Julian
We use Canberra Alpha Sentry CAM to monitor Ac-227
airborne activity here at Mound, a DOE facility. We
also use its radon compensation feature to minimize
radon background interference. Since alpha spectrum
is involved, Ac-227 calibration source is required for
our application.
Yong Zhu
Rad Engineer
BWXT of Ohio
zhuyn@doe-md.gov
937 8653774
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