RE: Glow in the Dark Watches

[vchase@bi-pharm.com]

I too have a Seiko watch with luminescent dial.  When using a thin window to 
survey my hands,  I was surprised that my watch gave a significant reading. 
 After some investigation,  I found out that Seido used Pm-147 in the hands 
and number dots of the dials of certain models of their watches.

Regards,
Vince Chase
vchase@bi-pharm.com
Radiation Safety Officer
Boehringer Ingelheim Pharmaceuticals
The opinions expressed here are those of the author and do not represent
the opinions policies or practices of Boehringer Ingelheim Pharmaceuticals.


 ----------
From: hberger@trinity.tamu.edu
To: radsafe@romulus.ehs.uiuc.edu; CHASE, VINCE AD BIPUS
Subject: Glow in the Dark Watches
Date: Wednesday, December 17, 1997 12:45PM

<<File Attachment: ENVELOPE.TXT>>
Yesterday a colleague of mine kept alarming our Hand and Foot Gas flow
proportional counter on her left hand. After some trouble shooting I did a
gamma spec on her watch with an HPGe. The analysis revealed Eu-152 and
Eu-154. A separate gas flow measurement indicated ~1600 dpm on the face of
the watch. The manufacturer of the watch is Seiko. Has anyone ever heard
of Europium being used to illuminate a watch dial? Any insight into this
will be greatly appreciated. Thanks in advance.

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