Re: update/summary real time extremity dosimetry

["Sandy Perle" <sandyfl@EARTHLINK.NET>]

On 21 Nov 2004 at 8:54, JGinniver@AOL.COM wrote:



> I'd like to start by thanking all those who replied to my recent

> question on real time extremity dosimetry.



Hello Julian,



I would be very interested in how the manufacturers of all these real-

time extremity monitoring systems state how they calibrate their 

units in that the accurate dose is highly dependent on the energy 

calibration factor, and, what their energy response is across the 

various radiation types, i.e., photon and beta. I would also be 

interested in how their units perform in mixed fields. I would also 

be very interested in how thin the manufacturers can make the 

attenuation material over the detector, since that would preclude 

certain types of radiation with specific energies from penetrating 

down to the detector. I think many companies state that they can 

detect and report extremity dose, but the devil is in the details. It 

would be interesting to see how these real-time detectors perform in 

an IEC or ANSI Performance Test Environment, where photons and beta 

are used, individually or in mixed fields. In the USA the ANSI N13.32-

1995 Performance Test is currently voluntary for NVLAP accredited 

labs. Extremity reporting can be quite accurate for today's passive 

dosimeters, but the accuracy is based solely on the various 

correction factors incorporated in the algorithm. I expect that the 

reason that you aren't provided much data is because that data shows, 

yes, they can measure extremity dose, but the performance isn't quite 

that good, unless the exposure of interest just happens to be that of 

what was used to calibrate their instrument. 



Regards,



----------------------------------------------------------------

Sandy Perle 

Senior Vice President, Technical Operations 

Global Dosimetry Solutions, Inc. 

2652 McGaw Avenue

Irvine, CA 92614



Tel: (949) 296-2306 / (888) 437-1714 Extension 2306 

Fax:(949) 296-1144



Global Dosimetry Website: http://www.dosimetry.com/ 

Personal Website: http://sandy-travels.com/ 



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