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RE: liver spleen scan
Tom,
The restrictions on exposure are driven by the Tc-99m emissions, not those
from Tc-99. The imaging is based on the compound used, which I assume is
sulfur colloid or albumin collioid labeled Tc-99m, and the administered
activity is probably less than 10 mCi (370 MBq). The patient should be
given instructions to reduce activities with other people if there is a
chance the people would receive over 100 mrem (1 mSv) from the patient's
administered dose. With a procedure using Tc-99m, the patient would be
given instructions if the administered dose was 150 mCi (5.55 GBq). I
really doubt that any instructions will be given. See appendix U of
http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1556/v9/nureg-1
556-9.pdf, which starts on page 330 of this pdf file.
If the patient has any concerns, they should take to the physician.
-- John
John Jacobus, MS, CHP
jenday1@msn.com
-----Original Message-----
From: M Nivas [mailto:motnivas@YAHOO.COM]
Sent: Monday, December 23, 2002 9:17 PM
To: radsafe
Subject: liver spleen scan
Greetings all,
A friend of mine is having a liver spleen scan with
technetium m99. I beleive this has a half life of
about six hours - then it turns into technetium 99
with a half life over A hundred thousand years. The
question he has is should he keep distance from family
and how long? I looked up the biological half life
and it seems to be 60 hrs.
Also, I guess he will find out tomorrow, what the
initial dose is - (I do not know of the dose usually
given for this diagnostic test).
Any useful knowledge would br deeply appreciated
Thanks in advance - Tom Savin
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