"Kolb, William (WKOLB)" <WKOLB@arinc.com> wrote:
The table on page 67 of "Living With Radiation: The First Hundred Years"
indicates typical Ra-226 activity for watches as 0.1 uCi and the 10CFR30
limit as 3 uCi. Page 81 shows a watchmakers assortment of replacement radium
hands containing a total of 0.7 uCi. There are probably 200 hands in the kit
but I could get the exact count if you are interested. In addition to the
hands, the watch might have radium dots or fully painted numerals. As an
autoradiograph on p. 81 shows, the amount of paint varies considerably among
brands.
bill
WM Kolb
ARINC
410 266-4017
-----Original Message-----
From: Otto G. Raabe [mailto:ograabe@UCDAVIS.EDU]
Sent: Thursday, November 08, 2001 5:38 PM
To: radsafe@list.vanderbilt.edu
Subject: Radium on Luminous Dial Watches
November 8, 2001
Davis, CA
Does anyone know approximately how much Ra-226 w! as present
on the face of a
typical radium-dial wrist-watch used during the first half
of the 20th
Century?
Thanks....
Otto
*****************************************************
Prof. Otto G. Raabe, Ph.D., CHP
Center for Health and the Environment (CHE)
(Street address: Building 3792, Old Davis
Road)
University of California, Davis, CA 95616
Phone: 530-752-7754 FAX: 530-758-6140
E-mail ograabe@ucdavis.edu
*****************************************************
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