Re: Security Screening Technique

[Tom Hazlett <tomhaz@AOL.COM>]

I can't speak for all field portable spectrometers.  The one I am 

familiar, with XRF Corporation's ICS-4000, has a FWHM at Cs137 of 10 keV 

@ 662 keV  (about 1.5%) and a lower level noise of less than 10 keV.   

The library includes medical, industrial and special nuclear materials. 

In fact their are about 160 isotopes in the library.  Many of these are 

very specialized.  For example nuclear power plant applications for the 

spectrometer involve many isotopes with very short half lives that 

wouldn't be encountered outside a power plant.  The isotopes more 

commonly used are all available in the library and in "point and shoot 

mode" the spectrometer is able to identify micro curie quantities of 

these isotopes, whether medical, industrial, norm or whatever 

simultaneously in just a few seconds.



I don't often talk about the ICS-4000 on the list because it isn't the 

right place to market products, but I think it is on point regarding  

this thread to talk about the technical capabilities of the instrument.



Regards,.

Tom Hazlett

XRF Corporation





tgi@cit.bg wrote:



>>Some  CZT based devices have 

>>good resolution ....

>>

>

>How good do they get? How many keV FWHM @ 661.6 keV? Or at 1332.5, if

>this would be the preferred spec?

>

>

>>...and are able to identify  isotopes accurately and report 

>>their most common use ie. medical, industrial etc..  

>>

>

>Are you saying you can use one of them to assess with sufficient

>certainty the quality and quantity of an unknown sample, walking

>on the street, to an extent when you can say "OK, this is just

>someone after medical treatment, no alarm to the officer"?

>

>>The sensitivity of 

>>CZT is more than adequate to scan people who have been injected with 

>>isotopes.

>>

>

>Sure, especially since you know what they have been injected with.

>

>Dimiter

>

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