[ RadSafe ] Re:Source in Twin towers

[Thomas Johnston]

Found it, or at least one reference that I previously came across. And from
a reputable source. No 'pun' intended.
~Tom Johnston

On Mon, Oct 5, 2009 at 1:43 PM, Brennan, Mike (DOH) <Mike.Brennan at doh.wa.gov
> wrote:

> On a total activity basis, K-40 undoubtedly as the isotope that
> contributed the most activity in that disaster.
>
> In any event, radioactivity is so far down health hazards associated
> with the Twin Towers that I hope no one spent much time worrying about
> it, especially as the pathway of greatest concern was inhalation, and
> the measures taken to protect from much greater inhalation hazards would
> work nicely for any rad mat in the wreckage and rubble.
>
> -----Original Message-----
> From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
> Behalf Of Geo>K0FF
> Sent: Monday, October 05, 2009 9:40 AM
> To: radsafe at radlab.nl; Clayton J Bradt
> Subject: Re: [ RadSafe ] Re:Source in Twin towers
>
>
> Clayton, what about the possibility of hundreds of kg of DU in the
> counterweights in the airplanes. Was it serendipity that these two
> planes either had them replaced with other materials ( tungsten?) or
> never had it in the first place? Or did they. The manufacturer's claim
> no.
>
> 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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