[ RadSafe ] Hot particles on automobile air filters

[franz.schoenhofer at chello.at]

Chris,-
So you are doing a NaI(Tl) low resolution experiment. What an exciting experiment. Already 15 years (and longer) ago we used within Europe exclusively Germanium detectors, because of the necessary resolution. And the "experiment" was always to put a sample on the detector and press the "count" button. Of course for impressing your lay clientel the words "low resolution, NaI, experiment" wil be  much more impressive than "we put a sample on the detector and the technician presses the "count" button. This is the usual way how to impress these people. Haven't you ever thought , that on RADSAFE there are quite a lot of knowledgable people? 

However you show a lack of radiation protection knowledge. To calculate the contributing dose from fresh fallout Cs-134 is a fundamental requirement in radiation protection and was taken into considreration of for instance the EU regulations after the accident. It is not at all negligible compared to Cs-137. Aren't you and your affiliations always distributing propaganda about the dangers of radioactivity? Why do you then neglect Cs-134? Because it is more difficult to measure it separately from Cs-137? I know about countries which introduced a kind of "gross cesium" to account for total cesium of Cs-137+134., Though I am absolute against any gross measurements I think that this was in the case of the nuclear accident justified, because the energies arte not to wide apart. I am not supporting any   

You write about "we saw this in Europe...."  Who is "we"? I have during all these years never heard or read anything about a "Chris Busby".  It is a common trick of uninvolved persons to put oneself into the middle of action by saying "we". So what did you see in Europe? In Scandinavia, in Greece, in Spain, Bulgaria, Hungary, etc. etc.  The only thing you could have seen is a tremendous inhomogeneity - if you ever bothered to check the reports of the various countries in Europe. I have at least 50 kilos of them at home.i

"A lot more iodine than Cs": Which iodine? 131, 132,? Volatile molecular iodine? Methyl iodine? Iodide in ionic form? Iodate? They all have very different impact on humans and very different dose coefficients. Do you base your comment on activity or mass? Chris, in all friendship, you seem to need an update on your radiation protection knowledge. 

Best regards,

Franz

---- "Busby schrieb:
> 
> 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  
> 
> 
> 
> 

--
Franz Schoenhofer, PhD, MinRat
Habicherg. 31/7
A-1160 Vienna
Austria
mobile: ++43 699 1706 1227