Re: I-131 THERAPY DOSES AT NUC MED FACILITIES

["William A. Fendt" <35346@strauss.udel.edu>]

With that volume of air it seems likely that your air sample may not 
detect radioactivity indistinguishable from background levels.  If you 
are confident that your sampling arrangement is appropriate, it seems 
that you can demonstrate compliance by recording the MDA of your sampling 
configuration (provided the MDA is below your effluent ALARA action 
level).  
Side note: We note a release of 0.05 to 0.1% of the starting activity 
during most radioiodination procedures.  WF U of DE


On Mon, 18 Jul 1994, Abdul BENZIKRI wrote:

> 
> Dear Reader:
> 
> I understand that a fraction of iodine-131 therapy doses volatilizes and
> escapes the open vial.  I am wondering what methods do other Nuclear
> Medicine facilities use to  account for this fraction and show effluent
> concentration is within DAC.
> 
> We in-line sample the exhausted air using charcoal filter.  A 12,000 CFM
> outside air is introduced to the air exhaust from our Nuclear Medicine hood.
> It seems that the fraction of I-131 volatilized is diluted to BKG
> concentrations.  If you sample the air using activated charcoal, have you
> detected any I-131?  I thank you for your forthcoming response.
> 
> Abdul Ben-Zikri, HP
> UW-Madsion
> abdul.benzikri@mail.admin.wisc.edu
> 
>