Re: cyrtolite Little Patsy OT- XRF Bassetite under X-Ray tube
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Charles,
It is a Si-Pin. You¡¯ll note the 4 pt cal is very linear with
deviations of 0, -0.15, 0.03 and 0.16 and the same when ?using a quadratic fit.
Geo reran the cal and only shifted the 5.6 from 202 to 198 which didn¡¯t change
anything. The problem is the mineral is supposedly a very simple Fe, U phosphate.
The Fe 6.4 line is located on the left shoulder of the strong peak located at
6.63. The U, although noisy, falls pretty much where it belongs. So what is the
broad peak complex at 6.63 due to? Lots of rare earths fall in this region but I
wouldn¡¯t expect that much of a response and I don¡¯t see anything lining up.
I guess the best approach would be to re run this sample at a 4096
conversion gain and increase the beam flux and count time.
Dud
?
?Behalf
Of Charles
David Young
Sent: Tuesday, January 28, 2020 9:16 AM
To: [email protected]
Subject: Re: [XRF] cyrtolite Little Patsy OT- XRF Bassetite under X-Ray
tube
?
Yeah, this confuses me as well.? Is this Si-PIN??
The cal is 4 points that are not linear and very different from the 2 point cal
that I have been using with Si-PIN.
?
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On Mon, Jan 27, 2020 at 11:47 AM < GEOelectronics@...>
wrote:
Skip over to the "2020" thread for the latest Dud.
By the way the telephone is on here if you need.
----- Original Message -----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 27 Jan 2020 12:51:15 -0500 (EST)
Subject: Re: [XRF] cyrtolite Little Patsy OT- XRF Bassetite under X-Ray tube
Geo,
Something
is wrong here. Is your E cal correct? The ¡°Fe¡± is not
centered and these peaks are too broad. I assume you¡¯re using the new sample
chamber. Where is ?this background coming from? Re-run a better rock and
look
at the difference.? I think you have a bad geometry setup between the
sample, detector
and the X-ray beam. Re run an old sample and compare the differences.? I¡¯m
confused on this.
dud
?
?
Sorry
interruption, this is the Basserite scan for Charles,
plus a no-sample scan for background info- and there's a lot of background with
a full lead shield!
To my eyes-? lots of iron, very little uranium XRF when compared to iron.
Geo
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