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RE: Missing Exit Signs
When one takes into account the occupation factor, ( How much time any individual is likely to spend in close proximity to the isotopic deposition), and the intent of use (i.e. these signs were meant as self lit EXIT signs...not given to the bomb fodder scenerio)the curie content is reasonable in my view. Take a look at what would happen if you incorporated any number of readily available items into an explosive endeavor.....20 pounds of Coleman Lantern Mantles, 2 litres of mercury, a 55 gallon barrel of nutmeg powder, ... I'm sure everyone can see where this is going. The missing signs are more than likely installed elsewhere....someone's side business, home, garage, dorm room.....who knows. It could have been a case of bad inventory control and a slip of the pen. I really don't think it's anything to be too concerned about.
Floyd W. Flanigan B.S.Nuc.H.P.
-----Original Message-----
From: owner-radsafe@list.vanderbilt.edu
[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of John R Johnson
Sent: Thursday, March 11, 2004 9:34 AM
To: Carol Marcus; jjcohen; Williamson, Matthew/Medical Physics; Radsafe
Subject: RE: Missing Exit Signs
Carol and other Radsafers
That is the ALI for tritiated water. I don't know what the one for luminous
paint is but it should be higher; i.e. even a smaller dose concern.
My concern with this type of "incident" is not dose or risk , but "poor
practise". Organizations should know better!
_________________
John R Johnson, Ph.D.
*****
President, IDIAS, Inc
4535 West 9-Th Ave
Vancouver B. C.
V6R 2E2
(604) 222-9840
idias@interchange.ubc.ca
*****
or most mornings
Consultant in Radiation Protection
TRIUMF
4004 Wesbrook Mall
Vancouver B. C.
V6R 2E2
(604) 222-1047 Ext. 6610
Fax: (604) 222-7309
johnsjr@triumf.ca
-----Original Message-----
From: owner-radsafe@list.vanderbilt.edu
[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of Carol Marcus
Sent: March 10, 2004 8:49 PM
To: jjcohen; Williamson, Matthew/Medical Physics; Radsafe
Subject: Re: Missing Exit Signs
At 04:10 PM 3/10/2004, jjcohen wrote:
> From a health and safety standpoint, if any radionuclide deserves to be
>pooh-poohed, I think that tritium would be a leading candidate.
>In any case, it is implied that 55 ci is a serious quantity.
>Is there any level low enough to be considered
>de minimis (pooh-poohable)? Given its apparent understanding of
>radioactivity, the public could likely be "terrorized" by a few picocuries.
Dear Radsafers:
Given the fact that the ALI for ingestion or inhalation of tritium is 80
mCi, there probably isn't much to worry about. If you tell the public that
a good treatment for tritium internalization is beer, and that anyone
contaminated should go home and tank up, maybe a lot of folks would calm
down. Especially if they get a little drunk.............!
Ciao, Carol
Carol S. Marcus, Ph.D., M.D.
<csmarcus@ucla.edu>
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