AW: [ RadSafe ] a question about 'canary' personal dosimeters

[Franz Schönhofer]

Dear Marcel, Nick et al.,

Thank you for these contributions. I have always wondered why Wallac OY
advertised, that their ultra low-level counters "Quantulus" were specially
shielded for EMF. My laboratory with four Quantuli was close to the Viennese
"underground - above ground" commuter system and whenever a train arrived or
departed our computer screens changed colours. The Quantuli were unaffected.


I think that producers of such equipment "should" (have to) provide their
instruments to be independent of any EMF interference. 

Best regards,

Franz

Franz Schoenhofer, PhD
MinRat i.R.
Habicherg. 31/7
A-1160 Wien/Vienna
AUSTRIA


-----Ursprüngliche Nachricht-----
Von: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] Im Auftrag
von Marcel Schouwenburg
Gesendet: Donnerstag, 20. Dezember 2007 11:10
An: Nick Tsurikov; radsafe at radlab.nl
Betreff: RE: [ RadSafe ] a question about 'canary' personal dosimeters

Nick,

You should definitely tell people not to have their EPDs to close to a
working cell phone. Not all of the EPDs have problems with this since
the newer ones are often shielded for EMF. We encountered the same kind
of problems in the past with some of our (unshielded) EPD's. Therefore,
as a rule we tell our students and staff to wear it on the other side of
their body and not next to their mobile phone. Even receiving one SMS
message could result in a nonsense dose of 100-200 microSv. Explaining
this to people who are unaware of this or are just starting a course in
health physics can be quite a challenge.

With kind regards,

Marcel Schouwenburg
Head / Lecturer Training Centre Delft, Health Physicist, expert level 2
National Centre for Radiation Protection (Dutch abbr. NCSV)
RadSafe Moderator and List Owner
Manager Quality Assurance Reactor Institute Delft (RID)

Delft University of Technology
Faculty of Applied Sciences / Reactor Institute Delft
Mekelweg 15
NL - 2629 JB  DELFT
The Netherlands
T: +31 (0)15 27 86575
F: +31 (0)15 27 81717
E: m.schouwenburg at tudelft.nl


-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Nick Tsurikov
Sent: donderdag 20 december 2007 8:49
To: radsafe at radlab.nl
Subject: [ RadSafe ] a question about 'canary' personal dosimeters

Dear friends,
A weird thing happened today - I've had the canary detector right next
to my
Nokia cell phone and when it rung the detector went berserk (counted
about
100 microSv in about 10 seconds - before I've answered the call).  Tried
it
on purpose afterwards - the same story but another ringing cell phone
next
to canary produced no effect...
Has anyone seen anything like that before?  Should I tell people to whom
I'm
giving the dosimeters not to have close to the cell phone?
Kind regards
Nick Tsurikov
Eneabba, Western Australia
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