The conspiracy of ignorance masquerades as common sense.
----- Original Message -----
Sent: Friday, February 01, 2002 2:50
PM
Subject: Removable Contamination Surveys
Can anyone give me some insight (and possible
source documents) into the reasons for the 100cm^2 standard (or suggestion?)
used for removable contamination surveys? Why is it 100cm^2 and not
1,000cm^2, or something smaller or larger? Is there anything wrong with
increasing the swiped area to increasing the likelihood of detection?
Specifically, assume a removable contamination
limit is set at 200 dpm/100cm^2 for a laboratory and a researcher wishes to
use a survey meter to count the swipes. According to the manufacturer's
formula and values (for efficiency of the radionuclide, etc), the meter has an
MDA of 400 dpm. Is there anything wrong with performing the survey over
200 cm^2 so that the detection limit would meet the removable contamination
limit?
Thanks,
Pete Jenkins
Confidentiality Note: The preceding e-mail message
(including any attachments) contains information that may be confidential,
protected by applicable legal privileges, or constitute non-public
information. It is intended to be conveyed only to the designated
recipient(s). If you are not an intended recipient of this message,
please notify the sender by replying to this message and then delete it from
your system. Use, dissemination, distribution or reproduction of this
message by unintended recipients is not authorized and may be
unlawful.