[ RadSafe ] Portal Monitors

Marco Caceci chemitech at chemitech.com
Wed Dec 19 08:39:49 CST 2007

See www.radal.com, they use GM tubes hence they respond down to 20-30 keV,
in case you are after the low energy x-rays from excited electron levels in
the products...
Plastic scintillators hardly ever are specified to go below say 50 keV, and
then, since calibration and sensitivity are done/specified with Cs137, field
installations have been known to be set with thresholds as high as 500 keV
(that cuts down the background...). Anyhow, if you had a system working
using plastic, GMs will do.
Hope this  helps.

Dr. Marco Caceci
L.Q.C. s.l.u., Vilabertran 15, 17130 La Escala, Spain
tel +34 902 88 4887 
mob +34 607 07 1196 
fax +34 972 98 0591 
chemitech at chemitech.com

-----Original Message-----
From: Hoffman, Daniel E [mailto:Daniel.Hoffman at covidien.com] 
Sent: Tuesday, December 18, 2007 4:55 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Portal Monitors

Dear RadSafers --
I am in search of information concerning portal monitors capable of
detecting gamma radiation from nuclides that decay via EC; therefore
traditional gas flow proportional detectors are not appropriate.  At our
facility we have older "Gamma 60" units with plastic scintillation
detectors that were manufactured by National Nuclear Corporation.
However, parts for these units have become increasingly difficult to

If anyone has recommendations on available systems to supplement or
replace our existing units please contact me.  I would also be
interested in any positive or negative experiences that folks have had
with specific manufacturer's units. 

Thank you.

Dan Hoffman

Daniel E. Hoffman, CHP, CSP, CHMM
Radiation Safety Officer 
2703 Wagner Place
Maryland Heights, MO 63043
314-654-7906 (office)
daniel.hoffman at covidien.com

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