[ RadSafe ] RE: Delivery of O-3 in a Pet facility

Fri Aug 28 12:11:35 CDT 2009

Bill,

    I posed your question to a collegue to Stanford and he fowarded it along to one of his collegues and he received the following reply:

From: David Dick 
Sent: Friday, August 28, 2009 9:18 AM
To: 
Cc: Herren, Roy WS.
Subject: Re: Experience with O-3 being delivered in a PET facility

I don't think I've ever heard of ozone being delivered to a cyclotron/PET facility.  I do know that there is the potential for ozone production in the helium cooling system of a cyclotron if there is any oxygen gas contamination.  We have had that problem with the GE PETtrace at Stanford.  The helium cooling system (cools the target foils) develops leaks from time to time and if the cyclotron operator does not flush it thoroughly before a cyclotron run some oxygen from the vault air can end up in the system.  When the proton beam passes through the helium cooling window the energy from the beam results in ozone production from the oxygen gas.  The ozone eats away at the brass fittings of the helium cooling system, causing corrosion, cracking and more leaks which results in a vicious cycle until you have to rebuild the whole system.

That being said, the amount of ozone being produced is not large and it is exhausted through the building's HVAC.  Hope that helps.

Sincerely,
David Dick

--David Dick, Ph.D.
Head of Cyclotron Physics
Molecular Imaging Program at Stanford

________________________________
From: Bill DeForest <billd at prophysics.com>
To: King/Rich <kingr at san.rr.com>; radsafe at radlab.nl
Sent: Wednesday, August 26, 2009 8:24:49 PM
Subject: RE: [ RadSafe ] RE: Delivery of O-3 in a Pet facility

This is where a cyclotron is in the hospital.  Some say the delivery is
piped to the room as a free flowing gas.  Can this be correst?

Bill DeForest, CHP, DABR
President, ProPhysics Innovations, Inc.
billd at prophysics.com
400 Dominion Drive, #109 Morrisville, NC 27560 
(800) 835-3615 
(919) 465-2545 
Fax: (919) 465-2544

-----Original Message-----
From: King/Rich [mailto:kingr at san.rr.com] 
Sent: Wednesday, August 26, 2009 10:43 PM
To: Bill DeForest
Subject: Re: [ RadSafe ] RE: Delivery of O-3 in a Pet facility

fed x
----- Original Message ----- 
From: "Bill DeForest" <billd at prophysics.com>
To: <radsafe at radlab.nl>
Sent: Wednesday, August 26, 2009 7:28 PM
Subject: [ RadSafe ] RE: Delivery of O-3 in a Pet facility

Does anybody have any experience with O-3 being delivered in a PET facility?
How is it delivered?

Bill DeForest, CHP, DABR
President, ProPhysics Innovations, Inc.
billd at prophysics.com
400 Dominion Drive, #109 Morrisville, NC 27560
(800) 835-3615
(919) 465-2545
Fax: (919) 465-2544

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of ROY HERREN
Sent: Wednesday, August 26, 2009 7:36 PM
To: Jimsradco at aol.com; radsafe at radlab.nl
Subject: Re: [ RadSafe ] Sealed Source Disposal

EnergySolutions Inc., Utah, see http://www.sltrib.com/ci_12978578
Roy Herren

________________________________
From: "Jimsradco at aol.com" <Jimsradco at aol.com>
To: radsafe at radlab.nl
Sent: Tuesday, August 25, 2009 10:35:22 AM
Subject: [ RadSafe ] Sealed Source Disposal

Hello Radsafers,

Here's a topic that hasn't been discussed too much and one that we're very
curious about. Now that the Barnwell disposal site has been closed to almost

the entire country for over a year, what is happening to all the sealed
radioactive sources that used to be shipped there on a regular basis? We,
and
I'm sure the other radioactive waste handlers, processed and shipped
thousands of them a year to Barnwell and now virtually no sources are sent
there,
to our knowledge. I realize some of them are being returned to the
manufacturers and some can go to Los Alamos or Richland, but what about the
thousands
of small ones that aren't being sent to those facilities? I once heard that
there are in excess of 200,000 sealed sources in use around the US and most
have fairly short half-lives, relatively speaking. Makes one wonder where
they are all going. Comments?

Jim Bell
ADCO Services, Inc.
Tinley Park, IL
_jimsradco at aol.com_ (mailto:jimsradco at aol.com)

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