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Re: Anyone know about this? Meter for First Responders to detect HEU

On Fri, 28 Jan 2005 16:18:37 -0800 (PST), Gerry Blackwood  

<gpblackwood@sbcglobal.net> wrote:



> BTW just as a side note.....how do first responders react to HEU?  

> ...Ah....can somone please tell me what meter is used to detect HEU  

> without any tags in the first place??????

=================

Hi everyone:

I had mentioned in my prior post about the Ludlum 12-12 Survey Meter Pu  

Waste Estimator instrument which I've listed on eBay but did not describe  

it's design. For those interested, a general description follows:



The Model 12-12 gram estimator is setup to estimate mass quantities of  

fissile material in known configurations of controlled packages. It is  

sensitive to directional gamma fields associated with Pu-239 or U-235 in  

controlled quantities. It consists of a Ludlum 12 survey meter with a 0.5  

x 1-inch NaI [sodium iodide] detector mounted underneath. The detector has  

0.425-inch thick lead shielding on the sides, a lead collimnator with  

33-degree tapered aperture, and a 0.0625-inch thick cadmium window on the  

front. On the end of the detector is a positioning tube [4.625-inch ID x 5  

inches long] that allows the detector to be placed with repeatable  

geometry over a sample area.



A manual including general description, control functions, operation,  

calibration, and maintenance instructions is available as a pdf file upon  

request for interested parties to review. Please email me at  

farbersa@optonline.net to request this manual as a pdf file.





Instrument reads out in grams of Pu. The range of readout is 0 to 50 grams  

of Pu-239 or U-235.





Stewart Farber, MSPH

[203] 367-0791 [office]





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