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Part 3 - Orientation Survey
Assessing the Performance of

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the Vanta™ Analyzer’s Factory
Calibration on Your Samples.

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Hello and welcome to this third video

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providing advice on best
practice for use of

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portable XRF in
geochemical applications.

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I’m Marcus Lake.

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And I’m Todd Houlahan.

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In this video we’ll be
providing you information

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on orientation survey,
assessing your instrument’s

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factory calibration
against your samples.

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Todd, why do we need to assess

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the instrument’s factory calibration?

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Well, this is one of
the hardest things

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to explain to a customer,

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why the instrument doesn’t always get

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exactly the right answer
out of the box.

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There’s a comprehensive
X-ray physics related answer

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that’s based around X-ray absorption,

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X-ray enhancement,

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and the matrix effects
related to XRF spectroscopy.

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You can read about it
at great length online.

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The simple answer is

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the quality of the XRF result

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is reliant upon the sample itself.

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It depends on sample preparation,

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particle size,

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and most importantly that
sample’s own unique chemistry.

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Every geological sample is different

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and affects the results
of the XRF analysis.

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So we try and calibrate that in.

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In the factory in Boston
we use a range

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of certified reference materials

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covering multiple matrices

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and we teach the analyzer to read

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all those samples correctly.

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To create a generic calibration

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that should be suitable for
most geological environments.

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But the reality is we can’t replicate

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every possible geological scenario.

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So what does that mean for a user?

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It means we may not
get the right answer

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for every element every time.

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But we can do a calibration
onboard the analyzer,

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isn’t that correct?

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That’s right, we can
calibrate the analyzer

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and we’ll talk about
that in great detail

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in the next video.

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But this video is all about
informing the customer

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how to assess whether the
instrument’s factory calibration

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needs to be adjusted or whether

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they can live with the performance
of the factory calibration.

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So it’s not just point
and shoot, Todd.

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It can be,

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but this whole video series
is around the concept

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of orientation work at the beginning

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to maximize the value this technology

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can bring to your project.

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And what would you
recommend a user does?

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I recommend they simply test
a range of known samples,

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preferably samples from their project

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and compare the results
of the XRF with the lab.

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So what happens if a customer doesn’t

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have any assayed samples
from a laboratory?

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Then start using the instrument’s
factory calibration

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and gradually send off
some of those samples

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that you’ve tested with the
instrument’s factory calibration

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to the laboratory
and start a comparison.

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SRK did a fantastic project
a couple of years ago

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that we presented at the
PDAC workshop we did,

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where they were doing green
field iron ore exploration,

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early early stage,
no samples from site,

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so they bought one of the OREAS

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iron ore portable XRF kits,

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tuned the analyzer to the lab assays

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and had great confidence
when they arrived into the field,

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that the instrument was working well

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on some known certified
reference materials.

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OK, so let’s demonstrate.
Yeah, lets do that.

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This is one of the OREAS
CRM kits I mentioned.

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We tested the samples using
the Vanta analyzer’s

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factory calibration and plotted it up

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against the certified values.

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So how does the data look?
I’ll show you.

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Here is copper.

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Copper looks great, eh?

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It’s got very good
correlation and the two,

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there actually is two lines there
Marcus, would you believe?

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I can’t see the blue one
underneath the orange one,

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I’m sure it’s there.

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Lets look at iron.
Iron looks pretty good too.

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Its reporting a bit low
at higher concentrations

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it says there Todd. Yeah, yeah.

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There’s the certified values versus

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the XRF factory calibration.

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But the trending still looks good.

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Silica? Silica looks fabulous.

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Wow, out of the box.
Pretty impressive.

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Aluminum?
Wow, look at that aluminum.

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Again the trending looks great.

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Reporting a little bit lower.

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Yeah. In some of the concentrations.

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Ultimately, is it up to the user

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to decide whether they are happy

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with the instrument’s
factory calibration

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against known CRM’s or lab values?

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For sure. I mean it’s
all about fit for purpose.

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It goes back to the previous video

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where we tried to talk about
setting goals and objectives.

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Only the user can decide whether

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the factory calibration is good enough

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and achieves the objectives
that they set out for it.

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If the factory calibration is OK,

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use the factory calibration.

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But they can still fine tune
the factory calibration

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onboard their analyzer.

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They can and especially
when you get great correlation

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and linearity like we
saw in this example.

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They can adjust the factory
calibration either

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onboard the Vanta
or in a spreadsheet offline.

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If you can’t wait until our next video

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Jen Caban has completed
a short tutorial online

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Creating User Factors.

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Its available on our Olympus website

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or our YouTube channel.

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Todd, will we be seeing you again?

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I hope so mate, but where’s Aaron?

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I hope so too mate.
Is Aaron in Kalgoorlie?

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Karratha I thought.

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Kununurra?

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Maybe Karumba!