[ RadSafe ] FW: ...detection (BUSBY)

Mon Aug 8 14:47:37 CDT 2011

Chris, 

I'm confused.  How could the activity on the filter be larger if your assumptions change?  Isn't the activity on the filter simply what you measure, i.e., the activity on the filter? The calculations  (and assumptions) are all related to determining activity concentrations.  Granted the you could say that the there would have been more or less activity on the filter if collection efficiency, air flow, etc. changed, but all that is getting you back to concentration. 

I would also imagine the uncertainty in the  guestimated  air flow is pretty large and the other contributors' comments regarding particle size distributions, collection efficiency, etc., and driving scenarios (fast, slow, stop and go, idle time) add to the confounding of such calculations. 

Cindy 

----- 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 >, "The International Radiation Protection (Health Physics) Mailing List" < radsafe @ agni .phys. iit . edu >, "Richard D. Urban Jr." < radmax @ earthlink .net>, "The International Radiation Protection (Health Physics) Mailing List" < radsafe @ agni .phys. iit . edu > 
Sent: Monday, August 8, 2011 1:09:00 PM 
Subject: Re: [ RadSafe ] FW : Reporter's question about lower         limitsof         detection (BUSBY) 

Dear Mike, 
No 
It would be the activity Bq . 
It is the filter that we need to know the radioactivity content of since that is what the air passes through. 
The activity concentration i.e. Bq /kg would be of no utility whatever. 
Chris 

-----Original Message----- 
From: radsafe -bounces@ agni .phys. iit . edu on behalf of Cowie , Michael I 
Sent: Mon 08/08/2011 13:16 
To: The International Radiation Protection (Health Physics) Mailing        List; Richard D. Urban Jr.; The International Radiation Protection (Health Physics) Mailing        List 
Subject: Re: [ RadSafe ] FW : Reporter's question about lower limitsof         detection (BUSBY) 

Trying to remain civil Chris, if I accept all your "assumptions" would it not be the activity concentration that would be higher and not the activity? 

Mike 

-----Original Message----- 
From: radsafe -bounces at health.phys. iit . edu [ mailto : radsafe -bounces at health.phys. iit . edu ] On Behalf Of Busby, Chris 
Sent: Monday, August 08, 2011 2:15 PM 
To: Richard D. Urban Jr.; The International Radiation Protection (Health Physics) Mailing List; The International Radiation Protection (Health Physics) Mailing List 
Subject: Re: [ RadSafe ] FW : Reporter's question about lower limits of detection (BUSBY) 

Dear Radmax , 
Is that how you see yourself? Amazing! 
Most of physics is done with estimates and assumptions, but maybe you have not ever done any real physics. You then have a calculation result with levels of uncertainty which you allow for. Otherwise most of physics cannot be done. What we do know is the activity in Cs137 and Cs134 of the filters. The cars were driven for 150km before the filters were removed. The engine cc was 600cc (these are small engines that the Jap cars use). The assumption is that the mean rpm was 2500. This is a very conservative assumption as these were commuter cars. So the real value is likely to be higher. This would make the activity higher. Perhaps you know that a 4 stroke engine transfers its cc worth of air every 2 revolutions. As to the 50% trapping assumption,this ia also likely to be conservative. So if there is any error the real value will be higher. 
You, and Mr Franz, and a few others are so appallingly rude it is very difficult to deal with you as if you were scientists and not ignorant rednecks in some cheap bar. I thought the radsafe list was a discussion arena not some internet blog where idiots insult each other. Try to remain civil. 
Best regards 
Chris Busby 

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

From: radsafe -bounces@ agni .phys. iit . edu on behalf of Richard D. Urban Jr. 
Sent: Sun 07/08/2011 20:24 
To: The International Radiation Protection (Health Physics) Mailing     List 
Subject: Re: [ RadSafe ] FW : Reporter's question about lower limits of detection (BUSBY) 

And just how did you calculate that volume... RPM's ???  Were you driving with the owners of these cars?  What gear were they in?  What speed were they driving?  Correct tuning or improper air-fuel mixture?  Uphill, Downhill, standing still or moving slowly in traffic/debris fields, A/C on or off.. ?  Distance's from Fuku , time after event, direction to plume...?  How many thousands of cubic meters of air had entered these filters PRIOR to Fuku ??? 

50% eff but not 'sure' , Really?  You always seem to 'ASSUME' alot . 

Your numbers, just as the rest of your drivel, is again more ABSOLUTLEY CHERRY PICKED B.S. 

Any REAL scientist would not publish anything with your levels of uncertainty. 

Please just go away.  Don't come back until you have something actually 'quantifiable' . 

Radmax 

----- 
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