[ RadSafe ] UC Berkeley Nuclear EngineeringAir MonitoringStation | The Nuclear Engineering Depa

[Franz Schönhofer]

Mike, Jim, Roger et al.,

Forgive my typical European narrow mindedness, but I have introduced in the
early 80's with a collegue high volume sampling (50-100m3 per hour),
effective filters and routine high resolution Ge-gammaspectrometry in our
Austrian surveillance system. Not only were we able to detect fission
products of a chinese atmospheric nuclear test (the last one) but also this
system later on provided us with excellent data on the contamination of the
Chernobyl accident. I did not invent this procedure, I partly copied it from
the Finnish and Swedish radiation protection institutes. Other countries in
Europe had similar systems since long working. So what? What is so
extraordinary with the described set up?

A few days ago I wrote to RADSAFE on the importance of the chemical form of
I-131. - Obviously no reaction. I believe that the method of sampling
depends not only on what kind of radionuclides, but also which chemical
forms are wanted to be determined. I do not find in the most recent posts
any hint on the speciation of "iodine".

Best regards 

Franz


Franz Schoenhofer, PhD
MinRat i.R.
Habicherg. 31/7
A-1160 Wien/Vienna
AUSTRIA


-----Ursprüngliche Nachricht-----
Von: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] Im Auftrag von Jim Hardeman
Gesendet: Sonntag, 27. März 2011 22:53
An: The International Radiation Protection (Health Physics) Mailing List
Betreff: Re: [ RadSafe ] UC Berkeley Nuclear EngineeringAir
MonitoringStation | The Nuclear Engineering Depa

Mike --
 
Their "B" setup looks pretty good -- HEPA filter, which apparently slips
over the end of a 50% HpGe detector. Good collection efficiency, good
counting efficiency, and a LOT more air flow than a lo-vol sampler with a
charcoal canister. Looking at the published "pictures" of their gamma
spectra, I'd say they've got a pretty good setup there.
 
Jim

>>> "McNaughton, Michael" <mcnaught at lanl.gov> 3/27/2011 09:20 >>>
I notice that they are using filters and detecting I-131. I would be very
interested n discussing the effectiveness of filters for I-131. I know this
is not the standard and recommended method. However, it is difficult to pull
very large volumes of air through activated charcoal, and here at Los Alamos
we are not at present equipped to do high-vol sampling with activated
charcoal.

Mike McNaughton
LANL
mcnaught at lanl.gov 

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Roger Helbig
Sent: Sunday, March 27, 2011 2:15 AM
To: 'The International Radiation Protection (Health Physics) Mailing List'
Subject: [ RadSafe ] UC Berkeley Nuclear Engineering Air Monitoring Station
| The Nuclear Engineering Department At UC Berkeley

http://www.nuc.berkeley.edu/UCBAirSampling 

A good site for air sampling that is going on -

Roger

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