[meteorite-list] Fw: Re: Bassikounou OCTOBER 16th

From: Thomas Webb <webbth1_at_meteoritecentral.com>
Date: Sun, 11 Oct 2009 14:56:55 -0700 (PDT)
Message-ID: <116912.6858.qm_at_web36203.mail.mud.yahoo.com>

--- On Sun, 10/11/09, Thomas Webb <webbth1 at yahoo.com> wrote:

> From: Thomas Webb <webbth1 at yahoo.com>
> Subject: Re: [meteorite-list] Bassikounou OCTOBER 16th
> To: "Peter Marmet" <p.marmet at sunrise.ch>
> Date: Sunday, October 11, 2009, 5:55 PM
> Peter,
> I thought your first reply to my question was confirming
> Oct. 12 as the fall date. ??(email below)
> Thomas
>
> --- On Sun, 10/11/09, Peter Marmet <p.marmet at sunrise.ch>
> wrote:
>
> > From: Peter Marmet <p.marmet at sunrise.ch>
> > Subject: Re: [meteorite-list] Bassikounou OCTOBER
> 16th
> > To: Meteorite-list at meteoritecentral.com
> > Date: Sunday, October 11, 2009, 5:37 PM
> > Hi Doug
> >
> > the analysis was done by P. Weber, PPGUN.
> >
> > The results are from the Meteoritical Bulletin
> Database.
> >
> > In the Meteoritical Bulletin Database the fall date
> is
> > still Oct. 16 -
> > so officially it's Oct. 16, isn't it!
> >
> > I only found a hint why some sources mention Oct. 12
> for
> > the fall date!
> >
> > Cheers, Peter
> >
> >
> >
> >
> >
> > 2009/10/11 Mexicodoug <mexicodoug at aim.com>:
> > > Hi List, Peter,
> > >
> > > Could you give a little more detail, as 22Na has
> a
> > half life of about 950
> > > days and the experimental uncertainty of that
> > particular measurement
> > > apparently used to calculate the ratio was 11.6%,
> not
> > to mention worse
> > > uncertainties with the 26Al. It says the
> measurement
> > was between December
> > > and January of 2006.
> > >
> > > So for starters, did they measure the meteorite
> 9
> > months before it fell?
> > > OK, so maybe it is a typo in the link you gave
> (source
> > or on line
> > > Meteoritical Bulletin, but the same January 2006
> date
> > is currently on
> > > Svend?s website) and say they are both typos
> which
> > may or may not say
> > > something about precision: and should read
> January
> > 2007.
> > >
> > > If we assume the measurements were taken about 75
> days
> > after the fall and we
> > > throw around a ten percent order of magnitude as
> the
> > possible measurement
> > > error, would not the difference of 4 days
> (October 12
> > vs. Oct. 16) be
> > > totally lost in the error?
> > >
> > > It is more likely the measurements were just to
> prove
> > it was a fresh fall,
> > > but the ability to distinguish four days based on
> a
> > bunch of assumptions of
> > > the original composition seems far-fetched to me.
> That
> > must be what the
> > > scientists set out to prove.
> > >
> > > So, maybe the gamma spectroscopist had received
> the
> > October 12 date and only
> > > set out to prove it was reasonable. Surely if
> they had
> > received the October
> > > 16 date, they would have allowed it as consistent
> as
> > well - after all, over
> > > 99.7% of the 22Na would still be there (did I do
> that
> > right?), and this is
> > > dwarfed by the experimental error.
> > >
> > > As Jim mentioned I think a real witness needs to
> speak
> > up ... the press, as
> > > reported by Svend Buhl, has October 16 as the
> fall
> > date. So at the moment,
> > > it would seem the press is preferable to
> insignificant
> > digits being
> > > extended...
> > >
> > > Best wishes,
> > > Doug
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Peter Marmet <p.marmet at sunrise.ch>
> > > To: Meteorite-list at meteoritecentral.com
> > > Sent: Sun, Oct 11, 2009 3:28 pm
> > > Subject: Re: [meteorite-list] Bassikounou
> OCTOBER
> > 16th
> > >
> > >
> > >
> > > Hello Thomas,
> > >
> > > Cosmogenic radionuclides:
> > > (P. Weber, PPGUN) Gamma-spectroscopy performed
> in
> > December-January
> > > 2006 showed the presence of the following
> > radionuclides: 48V, 46Sc,
> > > 56Co, 54Mn, 58Co, 7Be, 51Cr, 57Co, 22Na, 26Al
> and
> > 60Co.
> > >
> > > Recalculated to 12 October 2006 22Na was
> 38.0?2.2 and
> > 26Al 31.5?2.1
> > > (both dpm/kg), the activity ratio of 1.21 is
> fully
> > consistent with a
> > > fall on that date.
> > >
> > > More info here: http://kuerzer.de/1u0Y557jF
> > >
> > > Cheers,
> > > Peter
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 2009/10/11 Thomas Webb <webbth1 at yahoo.com>:
> > >>
> > >> Jim and List,
> > >> The bulletin shows a discrepancy concerning
> the
> > fall date. ?In the
> > >
> > > data table
> > > it gives October 12, 2006 but in the writeup it
> is
> > October 16. ?I belive I
> > > was
> > > the first to offer any on ebay and at that time I
> gave
> > the fall date as Oct.
> > > 12
> > > and still have that date in my
> > > database. ?However, perhaps a corrected date
> was
> > > offered later.
> > >>
> > >> Can someone give us confirmation of the
> actual
> > date that it fell?
> > >> Thanks,
> > >> Thomas
> > >>
> > >> --- On Sun, 10/11/09, Jim Strope <nwa482 at comcast.net>
> > wrote:
> > >>
> > >>> From: Jim Strope <nwa482 at comcast.net>
> > >>> Subject: [meteorite-list] Bassikounou
> OCTOBER
> > 16th
> > >>> To: "Meteorite Central" <meteorite-list at meteoritecentral.com>
> > >>> Date: Sunday, October 11, 2009, 10:29 AM
> > >>>
> > >>>
> > >>> http://tin.er.usgs.gov/meteor/metbull.php?code=44876
> > >>>
> > >>> Jim Strope
> > >>> 421 Fourth Street
> > >>> Glen Dale, WV ?26038
> > >>>
> > >>> http://www.catchafallingstar.com/
> > >>>
> > ______________________________________________
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> > >>>
> > >>
> > >>
> > >>
> > >>
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Received on Sun 11 Oct 2009 05:56:55 PM PDT