[ RadSafe ] Re:Source in Twin towers

Tue Oct 6 03:30:30 CDT 2009

Yes, some large aircraft have crashed (fairly recently) that had DU
counterweights. 747 crashes at Stansted (UK) and Amsterdam (NL) spring
to mind

http://news.bbc.co.uk/1/hi/sci/tech/593649.stm?storyLink=%2523

Best regards

David Richardson
MTO Radiation Protection
Medical Physics
Essex County Hospital
Lexden Road
COLCHESTER
CO3 3NB

+44 (0)1206 744579

david.richardson at colchesterhospital.nhs.uk

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Geo>K0FF
Sent: 05 October 2009 17:40
To: radsafe at radlab.nl; Clayton J Bradt
Subject: Re: [ RadSafe ] Re:Source in Twin towers

<snip>

Have any large planes crashed that DID contain the DU for
counterweights?

>From  a chart on DU counterweights:

DC-10 1000 kg
L-1011 680 kg
747- 850 kg

Additionally, many aircraft parts, including engines are made with
thorium. 
All thorium isotopes are radioactive.

Cd-109, Am-241, Fe-55 could be present in industrial gauges had any been

stored in any of the offices in New York.

It is unlikely that the fire protection system's smoke detectors used 
Am-241, as most modern industrial detectors use the photoelectric
method, 
and other non radioactive methods. It is likely that any extra battery 
operated smoke detectors installed by the tenant DO contain Am-241.
However 
if Pyrotronics industrial smoke detectors happened to have been used in
a 
central system, they contain 80 uCi of Am 241 each.

Don't get me wrong, I am not a DU alarmist. I actually use DU in my
work, as 
shielding and as a beta source.

Other building materials of concern are asbestos ( used to fireproof
steel 
supports) and mercury ( 1 drop in every fluorescent lamp) One could
surmise 
that a substantial puddle of liquid mercury existed at the lowest point
in 
the rubble.

Pictures of thorium airplane parts, counterweights etc. by request. All 
taken by myself and with radiation detection equipment shown.

George Dowell
New London Nucleonics Lab 

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