Re: I need contacts for Inst.

["tom_dixie" <tom_dixie@MSN.COM>]

Mark,



More information is required.



How big is the floor?

How long has the radium been there?

Has the floor been resurfaced since the material was there?

Has the floor been painted?

What is the floor made of?

How much radium do you anticipate?

If you are using the large area gas flow proportional probes (239-1F) you

will need P-10 counting gas.  I would recommend a suspension mechanism for

the probes (like a floor monitor).

Is the structure occupied?

Do you observe a radon buildup in the structure?

The MCA and NaI will only be of use if there is sufficient activity and may

cause confusion rather than allow for release.

The 2221 is a good instument but there are better for dealing with this

situation because the 2221 requires two counts and a voltage change to count

for alpha and beta.

The alpha emissions are easily masked and both alpha and beta emissions from

the surface should be measured.

Be sure to clean the surface (remove all probe destroying debris) before

using the large area probes.



Tom O'Dou

tom_dixie@msn.com



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

From: "mark sasser" <duke99301@YAHOO.COM>

To: "RADSAFE" <radsafe@list.vanderbilt.edu>

Sent: Monday, April 09, 2001 11:47 AM

Subject: I need contacts for Inst.





>

> I need to rent some of the following items.

> I need to release a floor for radium.

> any ideas?

> thanks Mark Sasser RSO

>

> Two - 3 x 3 sodium iodide (Similar to Ludlum 44-20)

>     Two - alpha hand held detectors (Similar to Ludlum

> 43-90)

>     One - Multi-Channel Analyzer (MCA)

>     Five - 2221 Scaler/rate meters

>     Two - 500 cm Probes (Similar to Ludlum 239-1F)

>     Extra windows for the monitors and alphas

>

>

> =====

> mark sasser

> at duke99301@yahoo.com

> you can also reach me at duke9930@concentric.net

>

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