RE: Dosimeters and airport security - Relative Response of dosimeters

["Rob Gunter" <rgunter@SEC-TN.COM>]

Take a look at the difference between NVLAP and DOELAP and ask ANYONE if

they use the same algorithm for both.  You will find that they don't because

they would not perform as well on one or the other.  Next take a look at the

relative response of TLD (LiF, LiBO, etc) to photons of different energies.

You will see that even TLDs are energy dependant.  And how about those very

low E photons (less than 30 KeV), you will notice the response of all

dosimeters tailing off (or not shown in graphs) because they photons don't

penetrate the dosimeter hanger.  This must be corrected for.  If that isn't

enough, consider the calculation of Beta dose.  This is highly energy

dependant and your vendor will have different algorithms for different

"effective energies".



Life would be much easier if it wasn't that way, and I can say for certain

that no entity (nuclear power, national lab, etc) would ever consider doing

their own dosimetry if this were not the case.  This is why many health

physicists spend their careers doing dosimetry.



Yours,



Rob





Robert J. Gunter, CHP

East Tennessee Technology Park

Operations Support Manager

Safety and Ecology Corporation

Bldg 1020, Rm 18

Oak Ridge, TN 37830

Ph:  (865) 241-9748

Cell: (865) 556-4380

Pager:  (865) 873-0078



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

From: owner-radsafe@list.vanderbilt.edu

[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of Ted de Castro

Sent: Tuesday, January 14, 2003 11:28 AM

To: Rob Gunter

Cc: Radsafe

Subject: Re: Dosimeters and airport security - Relative Response of

dosimeters





Frankly - I find that very hard to believe and it would be a sad

statement indeed if it really were true!

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