[ RadSafe ] Instruments to certify exporting equipment clean

[The Wilsons]

How does this handle Strontium 90?

On 4/21/2011 9:38 AM, Robert J Gunter wrote:
> Greetings Peter et al,
>
>
> My company has supplied instruments and am working on a procedure for
> exactly this purpose.  Basically we have recommended a Ludlum Model 2221
> paired with a Ludlum Model 44-10 NaI probe.  This meter and probe
> combination is very capable of assessing natural background radiation.  Of
> course the background can change based on what you may be assessing.  For
> example, if you are shipping KCl, the Postassium (K) has a relatively high
> background due to naturally occurring K-40 isotope.  So you would want to
> have an unimpacted (pre-release) sample to use as your background if you are
> assessing something that has a relatively high concentration of naturally
> occurring radioactive material.
>
>
> We are nearly out of 44-10 probes but can get new ones.  We have a large
> number of the Ludlum Model 2221 meters for $1250 each (these are used but
> fully functional, Ludlum Instruments sells them new for double that price).
> We sell 44-10's for $560 and have two left.  Ludlum charges $1036 each for
> them.  We also sell the cable to connect the two for $30 each.  The
> advantage of the Ludlum Model 2221 is it has both a scaler and a ratemeter
> function.   This lets you document your daily background with a timed count.
> You can use this as a reference for counting your samples.  We tell our
> clients to assess further if the reading is 2X background.  This is
> basically a quick screening method that does not quantify anything.  We
> suppose that you will not likely find much and if you do, you would perform
> a more detailed analysis to determine if it is safe to ship the product.
> The NaI detector is far more sensitive when applied directly to the drum or
> container than any Ports radiation monitor is likely to be.
>
>
> The NaI probe is very sensitive and appropriate for what you are looking to
> assess (Mixed fission products).
>
>
> Yours,
>
> Rob
>
>
>
> Robert J. Gunter, MSc, CHP
>
> CHP Consultants/CHP Dosimetry
>
> www.chpconsultants.com
>
> www.chpdosimetry.com
>
> Toll Free: (888) 766-4833
>
> Fax:  (866) 491-9913
>
> Cel:  (865) 387-0028
>
> rjgunter at chpconsultants.com
>
>
>
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