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Re: question concerning stress tests
During the production of Tl-201, some long-lived
contaminates, i.e., Tl-200 and Tl-202 are created.
http://www.nuclearonline.org/PI/Mallinckrodt%20Thallium.pdf
Consequently, you can detect activity for up to 30
days and sometimes beyond. It is an an analogous to
potassium in the body, so it has a long biological
half-life.
--- Richard Smart <r.smart@unsw.edu.au> wrote:
> Dear Jaro,
>
> Some centres, including my own, use a combination of
> Tl201 and
> Tc99m-Cardiolite (Tl201 for the rest phase and
> Cardiolite for the stress).
> It is possible that your passenger had this
> combination.
>
> If Tc99m Cardiolite had been used for both the rest
> and stress phases of the
> study, the combined activity could be around 1500
> MBq. After 4 days, that
> would have decayed (excluding any biological
> excretion) to around 25 kBq.
>
> Richard
>
> ----- Original Message -----
> From: "Jaro" <jaro-10kbq@sympatico.ca>
> To: "RADSAFE" <radsafe@list.vanderbilt.edu>
> Sent: Monday, January 10, 2005 6:26 AM
> Subject: question concerning stress tests
>
>
> > A question concerning stress tests from another
> listserv I subscribe
> to.....
> >
> >
> > -----Original Message-----
> > From: cdn-nucl-l-admin@mailman1.cis.McMaster.CA
> > [mailto:cdn-nucl-l-admin@mailman1.cis.McMaster.CA]
> > Sent: Sunday, January 09, 2005 12:53 PM
> > To: cdn-nucl-l@mailman1.cis.mcmaster.ca
> > Subject: [cdn-nucl-l] Radiological/Nuclear
> Detection Portals
> >
> >
> > <snip>
> > It did remind me of an incident my wife reported
> following a bus trip to
> the
> > US with a group of seniors about a year ago. The
> lead bus she was on went
> > through the border inspection without delay. The
> second one was pulled
> over
> > and all the passengers were taken inside.
> >
> > Apparently radiation had been detected from the
> bus. The passengers were
> > then screened. Allegedly the border personnel
> advised one he had had been
> > through a “Cardiolite” stress test. It had been
> done 4 or 5 days earlier.
> > The passengers were very impressed with this
> apparently routine detective
> > work.
> >
> > My wife has had both Thallium and Cardiolite
> stress tests. She recalls the
> > procedure being slightly different. A check on
> the Internet indicates
> > Technetium-99m is the “nuclear agent” in
> Cardiolite. It has a half life of
> > only 6 hours. Thallium 201 with a half life of
> about 3 days is used for
> > thallium stress tests.
> >
> > It seems to me there would be little
> Technetium-99m left to detect after 4
> > days. Maybe lay people use the “Cardiolite” name
> loosely to describe both
> > types of tests? However, I’m just a mechanical
> engineer. Perhaps a nuclear
> > expert could judge the veracity of my wife’s
> travel story and comment on
> the
> > ability of border patrols to detect nuclear
> materials?
> > --
> > No virus found in this outgoing message.
> > Checked by AVG Anti-Virus.
> > Version: 7.0.300 / Virus Database: 265.6.9 -
> Release Date: 1/6/2005
> >
> >
>
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John Jacobus, MS
Certified Health Physicist
e-mail: crispy_bird@yahoo.com
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