Author Topic: Time Dependent Intensity (TDI) Corrections  (Read 18069 times)

John Donovan

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Re: Time Dependent Intensity (TDI) Corrections
« Reply #60 on: April 07, 2021, 12:00:00 PM »
Hi Andrew,
Interesting stuff.  I'm interested in this mineral, what is it?

But since the TDI fit is applied on a per point basis, I think looking at the statistics for each single point is a better way to evaluate this.
john
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Andrew Mott

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Re: Time Dependent Intensity (TDI) Corrections
« Reply #61 on: April 07, 2021, 12:41:11 PM »
John,

It's alunite/natroalunite - (K,Na)Al3(SO4)2(OH)6

So you would recommend evaluating the models on a point by point basis rather than trying to be consistent with the model used?

Thanks again.

Andrew

John Donovan

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Re: Time Dependent Intensity (TDI) Corrections
« Reply #62 on: April 07, 2021, 12:51:55 PM »
So you would recommend evaluating the models on a point by point basis rather than trying to be consistent with the model used?

Hi Andrew,
I think the model you use to evaluate the fit should be evaluated on a point by point basis since that is how the TDI correction is applied during the matrix iteration.

In your original examples it looked to me (based on the Relative Deviation % displayed) that the log-linear fit gave the smallest avg deviation.
john
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AndrewLocock

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Re: Time Dependent Intensity (TDI) Corrections
« Reply #63 on: April 07, 2021, 01:25:57 PM »
This may have been pointed out earlier, but:

The TDI intensities can be saved in Excel format, and then evaluated in Excel.
An example of Na intensities for a point in obsidian (15 kV, 6 nA, 5 micron beam diameter, nominally 30 s on peak) is in the PDF attachment.

Cheers,
Andrew Locock