RE: TLD badge dose

["Suleiman, Orhan" <SuleimanO@cder.fda.gov>]

Yes, they are CT systems.



I know there is/are several surveys on these scanners, but I am not closely

involved with them.   NIOSH is conducting one of them.



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

From: John Jacobus [mailto:crispy_bird@YAHOO.COM]

Sent: Friday, January 09, 2004 3:40 PM

To: Suleiman, Orhan; 'Flanigan, Floyd'; Wes Van Pelt; David Hornsey;

radsafe@list.vanderbilt.edu

Subject: RE: TLD badge dose





When you look at some of the newer scanning units,

they are really CT scanner.  I would expect the doses

to be significantly higher than the "standard"

carry-on scanners which are like fluoro units.



--- "Suleiman, Orhan" <SuleimanO@cder.fda.gov> wrote:

> The conventional x-ray baggage security systems are

> very low dose, but some

> of the new federal TSA screening systems advise

> passengers to NOT allow

> cameras with film because of the much higher doses. 

>  Film is relatively

> insensitive to x-rays (We published a study several

> years go that showed

> medical x-ray film, without an intensifying screen, 

> required more radiation

> than a patient did for conventional x-ray

> examinations), so when

> conventional film is precluded from scanning

> equipment, I suspect the doses

> are very high.  Unfortunately I do not have any

> actual data for the newer

> systems, but the reported doses are not surprising

> to me.

>  

>  

>  

>  

> 

> -----Original Message-----

> From: Flanigan, Floyd

> [mailto:Floyd.Flanigan@nmcco.com] 

> Sent: Friday, January 09, 2004 12:27 PM

> To: Wes Van Pelt; David Hornsey;

> radsafe@list.vanderbilt.edu

> Subject: RE: TLD badge dose

> 

> 

> Last week I ran a bunch of direct reading "pencils"

> through the x-ray

> machine at the security check point and checked them

> for accrued dose. 2

> mRem was the average between 60 "pencils".

>  

> Hope it helps.

>  

> Floyd W. Flanigan B.S.Nuc.H.P.

> 

> -----Original Message-----

> From: Wes Van Pelt [mailto:WesVanPelt@att.net]

> Sent: Friday, January 09, 2004 10:26 AM

> To: 'David Hornsey'; radsafe@list.vanderbilt.edu

> Subject: RE: TLD badge dose

> 

> 

> 

> David and Radsafers,

> 

>  

> 

> In my experience, a normal x-ray scan of carry-on

> baggage would give the

> luggage a dose of about 0.1 mrad (0.001 mSv). So a

> dose of 0.14 mSv seems

> MUCH too high for routine luggage scans, even if the

> luggage were scanned

> several times.

> 

>  

> 

> Regards,

> 

> Wes

> 

> Wesley R. Van Pelt, PhD, CIH, CHP

> 

> Wesley R. Van Pelt Associates, Inc.

> 

>  

> 

>  

> 

>    Good morning Radsafe,

> 

>  

> 

>        An X-ray thickness gauge manufacturing

> company I work for in the UK

> 

> sent three engineers to San Diego for training on a

> particular rig. All took

> 

> the TLD badges they were issued with here.

> Unfortunately the Company they

> 

> were working with in San Diego did not issue them

> with local monitoring.

> 

> They all carried out similar work whilst in the

> States, but one of them came

> 

> back with a badge reading of 1.4 mSv. 

> 

> .....

> 

>        So - is such a dose feasible for suitcase

> surveillance or could

> 

> anything in the baggage compartment of a 'plane

> result in an actual dose or

> 

> an artefact? Obviously not a real problem dose-wise

> unless it continues to

> 

> show up on his badges, but any thoughts would be

> most welcome to satisfy

> 

> both his and my curiosity.

> 

>  

> 

>   David Hornsey

> 

>  

> 

> Radiation Safety

> 

> South Building Annexe

> 

> University of Bath

> 

> Bath BA2 7AY

> 

> 01225 386540

> 

> e-mail:bssdjh@bath.ac.uk

> 

>  

> 

>

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> 





=====

+++++++++++++++++++

"There's no trick to being a humorist when you have the whole government

working for you."

Will Rogers



-- John

John Jacobus, MS

Certified Health Physicist

e-mail:  crispy_bird@yahoo.com



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