[ RadSafe ] Ra-226 Static Eliminator Bar
kenneth.marshall at carestream.com
Tue Apr 12 09:28:53 CDT 2011
I have seen similar bars, they are radium metal compression welded to a
thin gold foil (visible under the mesh grid on the bar's front).
The weldment is then inserted in a metal housing and fitted with a screen
mesh - assuming to protect the bar foil from abrasion & contact.
They are used for static charge elimination - alpha particles can pass
through the foil eliminating. static - . The alpha radiation creates a
cloud of ionized air - through this ionized air gives up its accumulated
excess electrical energy (static), thereby reducing or eliminating the
detrimental static. These were in use by Kodak (or was when I was last
there in 2007) to remove static electricity in film in manufacturing -
although they generally have switched to similar bars containing
Americium-241 and or Polonium-210. Variations are still made by NRD in
Grand Island, NY (USA).
They were and are also common to use for static elimination in other
scientific applications like precision balance / mass measurements to
remove static electricity - they usually have a screw on the bottom to
affix a metal ground strap of some sort.
In my experience with these is that you can expect the foil itself to be
surface contaminated with radium from alpha recoil creep so avoid touching
the foil - the mesh should do this. It would be prudent to wipe test the
mesh and entire item for contamination in my opinion.
Kenneth Marshall, RRPT
Radiation & Laser Safety Officer
Rochester, NY 14615
From: "BRISSON Nicolas" <nicolas.brisson at irsn.fr>
To: "The International Radiation Protection \(Health Physics\)
MailingList" <radsafe at health.phys.iit.edu>
Date: 04/12/2011 10:06 AM
Subject: [ RadSafe ] Ra-226 Static Eliminator Bar
Sent by: radsafe-bounces at health.phys.iit.edu
2 years ago we had a short discussion about radium-226 static eliminator
bar (excerpt below).
At that time I could only find the article mentioned below.
Last week I found a static eliminator bar from US Radium Corp.
As the dose rate ranged from 1 mSv/h to 1,6 mSv/h between 5 and 0 cm from
the bar, we didn’t spend too much time studying it at close range. So I
would be interested in layouts or any information available about these
route du Panorama
92262 FONTENAY AUX ROSES
tel : +33 1-58-35-87-24
por : +33 6-08-76-55-32
From: BRISSON Nicolas <nicolas.brisson at irsn.fr>
To: radsafe at radlab.nl
Sent: Wed, 28 October, 2009 20:58:57
Subject: TR: [ RadSafe ] Ra-226 Static eliminator bar
I don't have much information on this topic but you can find an article at
the web address below.
American Journal of Public Health (August 1950) :
In this article you can read that these static eliminator bars contained
25 or 50 µg of radium 226 per linear inch.
Some Ionotron with radium 226 were manufactured by US Radium Corps.
In France, you could buy a ionotron t.200 for around 20€ in 1960.
For a total length of 15 cm, the active part had a length of 5 cm. In the
safety sheet given with the ionotron, it was said that you were at the
safe distance from the ionotron at 25 cm. Remember though that it was in
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