Hi all-
I have a quick question that doesn't appear answered in the help file:
Is the analytical uncertainty reported for a given element (El %ERR) the 1 sigma or 2 sigma value?
-Dan
Hi Dan,
It's one sigma.
You can see that here in the User Reference Manual PDF (available from the PFE Help menu) if you search on "analytical sensitivity":
(https://smf.probesoftware.com/oldpics/i41.tinypic.com/16h3tdf.jpg)
and also here in the Probewin help file available from the Help menu also:
(https://smf.probesoftware.com/oldpics/i44.tinypic.com/s1q2vk.jpg)
Also here in the log window (if you use the Calculate Detection Limits checkbox in the Calculation Options dialog from the Analyze! window):
(https://smf.probesoftware.com/oldpics/i39.tinypic.com/b7xh85.jpg)
Sorry to "pile on", but just I love to show off how well documented the software really is! ;)
John-
While typing in 'Analytical Sensitivity' into the help file may be obvious for you, others may look for the variable names in the output file. This is the help file that was called up when I searched for 'output' . I'm glad that your documentation includes the equations used, but I would just suggest adding a hyperlink for some non-obvious variable names that require a little more information (e.g., CDL99 for me is intuitive -- but may not be for other people--, but %Err is not).
-Dan
Hi Dan,
Excellent point- I forgot about the F1 context sensitive help in the User Specified Output dialog!
You know what that means? It means that everything can be improved even more!
So, I'll add the sigma values to that section of the documentation... thanks!
PFE documentation updated (v. 10.1.7)
Here's a completely different and somewhat newly modified data output option that works very nicely in PFE for the calculation of "chemical ages" of monazites, by measuring U, Th, Pb (and Y and La for interference corrections on Pb). From the Analyze! window Calculation Option dialog one can turn this option on or off for selected samples as seen here:
(https://smf.probesoftware.com/oldpics/i59.tinypic.com/rvwtnd.jpg)
In addition please note the use of the calculation options for specifying CePO4 by difference so one obtains an accurate matrix correction without measuring all the REEs elements (they all produce similar matrix effects for the trace elements). This option produces the following output to the log window including the calculated U from Pb, Th from Pb, calculated Pb and chemical age:
(https://smf.probesoftware.com/oldpics/i43.tinypic.com/258v0hw.jpg)
Note the approximately 50% relative interference correction of Th interfering with U ma!
The TIMS age of this sample, Moacyr monazite is around 506 Mya, so we are within a single (rough) standard deviation. For export of this data one can also use the Output | Output U, Th and Pb Age Calculations and obtain Excel output as seen here:
(https://smf.probesoftware.com/oldpics/i43.tinypic.com/2z3otcj.jpg)
Julien Allaz made a suggestion recently that we include the U, Th, Pb *microprobe age* output in the user specified output options as seen here:
(https://smf.probesoftware.com/gallery/1_03_02_19_2_17_25.png)
We also modified "chemical age" to microprobe age" were it is visible to the user. Apparently some people feel strongly about this. :)
You rock! Thanks John!
For the little story, any age, whether it is obtained with isotope or with element is chemical in essence. Hence the change from the confusing term "chemical age" to "microprobe age", which clearly indicate which instrument is employed :)
Julien