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

[Thomas Webb]

--- 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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