[ RadSafe ] In-vivo Cs-137

[Cindy Bloom]

Kristof,

I appreciate the clarification;  the list provided no indication as to 
whether the radionuclides were administered to patients or not.  Some of 
the other "PET imaging" radionuclides listed at the Radiochemistry Society 
web site are very short-lived and I would guess that these might be 
administered to patients.  Other radionuclides on the list have longer 
physical half-lives (30+ days, although their biological half-lives might 
be relatively short), , e.g., H-3, Ge-68, Nb-95, Ru-103, Sc-46, and I'm 
curious if these are administered to patients.

Cindy

At 12:16 AM 1/24/2009 +0100, Kristof Baete (NUCLEAIRE GENEESKUNDE) wrote:
>Dear Cindy,
>
>Cs-137 is used in some PET systems to perform transmission scanning, it
>is not administered to the patient!
>
>Regards,
>Kristof
>
>Kristof Baete, PhD
>Medical Radiation Physicist
>Nuclear Medicine
>
>kristof.baete at uzleuven.be
>tel. +32 16 34 91 04
>tel. secr. +32 16 34 37 15
>
>UZ Leuven | campus Gasthuisberg | Herestraat 49 | B - 3000 Leuven |
>www.uzleuven.be
>
>
>-----Oorspronkelijk bericht-----
>Van: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] Namens
>Cindy Bloom
>Verzonden: vrijdag 23 januari 2009 18:22
>Aan: Brian Rees; radsafe at radlab.nl
>Onderwerp: Re: [ RadSafe ] In-vivo Cs-137
>
>Brian,
>
>I haven't heard of unsealed Cs-137 being used purposefully as a medical
>treatment (a very small amount of Cs-137 contamination might be on the
>surface of a sealed source).  I wonder if Cs-137 might be a contaminant
>in
>a radiopharmaceutical.
>
>This site,
>http://www.radiochemistry.org/nuclearmedicine/frames/medical_radioisotopes/,
>states that Cs-137 is used in PET imaging.  Interesting.
>
>Cindy
>
>At 08:49 PM 1/21/2009 -0700, Brian Rees wrote:
> >Is anyone aware of a medical treatment that would leave Cs-137 in an
> >out-patient?  If so, how much and for how long?
> >
> >I KNOW that it's typically used medically as an external source, or
> >in-patient brachytherapy.  I just don't know of any conceivable reason
>for
> >a person to have it in-vivo.
> >
> >Thanks,
> >Brian Rees
> >
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