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RE: Radioactive Walls
Do you suppose you may have been measuring the potassium-40 in the cement
blocks? When you moved the monitors to the center of the room, you still
had the problem; you just didn't worry about it any longer, right? Your
assumption is probably correct. Quarterly exchange is a viable alternative
when you are measuring low exposure levels and don't pick up anything in a
one-month reading, IMHO.
CULater......
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From: radsafe
To: Multiple recipients of list
Subject: Radioactive Walls
Date: Friday, June 07, 1996 1:13PM
Regarding Peter Vernigs Post:
We had a similar experience here. We decided to change our
monitoring period from monthly to quarterly. When we did, we found that all
TLDs in one location showed ~10-15 millirem exposures (even the control
badge).
Using a scintillation detector we found that the cement block walls
were slightly radioactive. The TLDs were moved to a partition in the center
of the room and we haven't had a problem since.
Evidently the threshold of the TLD was not exceeded during the
one-month monitoring period therefore zero doses were reported.
**************************** /^\ /^\ *********************************
Tad Blanchard /__ \ /___\ NASA-Goddard Space Flt Ctr
Nat'l Health Svc, Inc O Greenbelt, Maryland
Sr Health Physics Tech / \ Phone: 301-286-9157
/___\
Tad.M.Blanchard.1@GSFC.NASA.gov
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