RE: Radioactive "seed" treatment no threat I-125 only??

[Thomas Morgan <tmorgan@isotopeproducts.com>]

1.  With short half-lives, I-125 and Pd-103 seeds are typically used for 
permanent implants.  Cs-137 is used for temporary implants.
2.  The most frequent use for I-125 and Pd-103 is in the treatment of 
prostate cancer.  Cs-137 is most often used for localized treatment of 
patients with cervical or uterine cancer.
3.  X-rays emitted by I-125 and Pd-103 have a low energy and hence, a short 
effective range in tissue.  Hence, these isotopes are used where the 
physician wishes to confine the radiation treatment to a small, restricted, 
volume (typically 100 cc or less).  Cs-137 emits much higher energy gamma 
rays and is suitable for use when larger volumes must be treated.

Thomas L. Morgan, Ph.D.
Director, Health Physics
Radiation Safety Officer
Isotope Products Labs
Burbank, CA

-----Original Message-----
From:	Nicholas J Harmon [SMTP:nicholas.harmon@exeloncorp.com]
Sent:	Monday, December 04, 2000 4:27 AM
To:	Multiple recipients of list
Subject:	Re: Radioactive "seed" treatment no threat I-125 only??


What is the difference between the manner in which Cs-137 and I-125 are
used in brachytherapy?



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