[ RadSafe ] Hot particles on automobile air filters

[Busby, Chris]

The result was from an NaI low resolution high sensitivity experiment and I only looked for the Cs and I. I can go back and check the Cs134 but I am doing some long count time germanium stuff so metter wait till that.
I agreed with what you wrote.
But there was a lot more Iodine than Cs to begin with; we saw the same effect in Europe 
C 




Chris, 

  

I'm not quite sure about what you are agreeing, although it always seems nice when folks are agreeable (until one falls off the cliff :-)). 

  

As to the ratios of I-131:Cs-137, I agree the initial ratio would likely be greater than 1, but the ratios to Cs-137 would be significant for other iodines and cesiums , as well as other radionuclides , and it seems odd these nuclides  wouldn't also be seen on the filters. 


Cindy Bloom 

  

P.S.  It seems to be the general convention on this list to have the most recent note at the top. 


----- Original Message -----




From: "Chris Busby" <C.Busby at ulster.ac. uk > 
To: "The International Radiation Protection (Health Physics) Mailing List" < radsafe @ agni .phys. iit . edu > 
Sent: Friday, June 24, 2011 3:19:05 PM 
Subject: Re: [ RadSafe ] Hot particles on automobile air filters 




-----Original Message----- 
From: radsafe -bounces@ agni .phys. iit . edu on behalf of radbloom @comcast.net 
Sent: Fri 24/06/2011 16:14 
To: The International Radiation Protection (Health Physics) Mailing List 
Cc: The International Radiation Protection (Health Physics) Mailing List 
Subject: Re: [ RadSafe ] Hot particles on automobile air filters 
  


I'm curious about the retention efficiency of iodine vs cesium on these filters.  I know the chemical form of the iodine would affect its collection efficiency, but typically carbon filters, not particulate filters, are used to (most efficiently) collect iodine species.  Also, it's noted that the filters have been in transit for a long time - is that long compared to I-131's 8-day half-life, or just long compared to the radon progenies' half-lives? 

  

Cindy Bloom