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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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