[ RadSafe ] Intrinsically safe survey meter

Brent Rogers brent.rogers at optusnet.com.au
Thu Dec 25 22:59:42 CST 2008

I've had good luck with the Ludlum 2929 (does an excellent job at reporting
concurrent alpha and beta counts) as well, but can't speak for whether or
not it is intrinsically safe.  I would presume so, but haven't seen any
documentation making the claim.  It isn't portable, i.e. needs to be plugged
in, so that may or may not disqualify it.

Regards and Happy Holidays
Brent Rogers
Sydney Australia

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Geo>K0FF
Sent: Wednesday, 24 December 2008 10:32 AM
To: Radsafe at Radlab.Nl
Subject: [ RadSafe ] Intrinsically safe survey meter

Q: "Date: Mon, 22 Dec 2008 07:43:07 -0500
From: "Carl Speer" <cspeer at secradcon.com>
Subject: [ RadSafe ] Intrinsically safe survey meter
To: <radsafe at radlab.nl>
Message-ID: <000301c96432$d7a07790$b4accfd8 at secradcon.com>
Content-Type: text/plain; charset="us-ascii"

I have a need for an intrinsically safe (explosion proof) alpha survey
meter. Ideally I need a dual alpha/beta survey instrument. I have found
where Ludlum now makes the Model 3-IS with a 44-9 alpha/beta/gamma probe but
with my application I need to distinguish between alpha and beta

Does anybody here have any first hand experience with an intrinsically safe
survey meter? Does anyone have suggestions for a vendor or model? Also, any
specific operation considerations would be appreciated.


Carl Speer

Safety and Ecology Group

Oak Ridge, TN"

A: Carl, I have the Tracerco T201 and T202. The T 201 is just a pancake
detector. The T202 is Gamma/X-Ray only.  

The pancake will detect alpha and beta fine, and I suppose a filter could be
used to discriminate, but nothing like a  Ludlum 2224, 2360 or 2929 all of
which I also own ( none for sale, mine personally).

Do you have to log the individual alpha and beta counts?  It's pretty easy
to use a regular pancake like the Ludlum 44-9, up close to the surface for
contamination monitoring, if a hot spot is noticed, pull it back 2 inches.
Alphas won't travel that far in air but betas can ( 10 feet per MeV more or
less). To read the Gamma/X-Ray component, flip it over, read through the
back of the 44-9. It takes longer to say it than it does to do it. 

George Dowell
New London Nucleonics Lab

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