Re: Small Sample Size XRF with low power (tube) excitation
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" While Sulfur is at 2. so is Mo La1,2.and in that you have a lot of Mo I¡¯d have to call this Mo La1,2."
Will check that tomorrow against a Mo only stamp with same setup.
" counts are closer together yet it still has a 65% dead time"
How are you getting 65%> There is zero deadtime showing on the readout, right?
Can you point out the spikes on the peak you mentioned?
The 27kV was set by adjustment, as was the current. By that I mean they were adjusted while running, then the setting decided, and only then the real test run was started. Don't forget, there is no energy in the beam to speak of anywhere below 20 or so kV. The internal filter knocks that way back. Only the vestigial tungsten L Lines, and those are greatly attenuated. I posted? a test series only a few days ago with that data.
Geo
From: "DFEMER" <dfemer@...> To: [email protected]Sent: Wednesday, February 3, 2021 6:26:50 PM Subject: Re: [XRF] Small Sample Size XRF with low power (tube) excitation
Geo,
Lookin' better, PUR is on
and fast/ slow counts are closer together yet it still has a 65% dead time and
it? still has some low energy noise below 0.62 keV that could be taken out. Getting
rid of that will increase the number of valid counts you¡¯re getting per unit
time. A gain of 2.9 in the number of valid counts for the 300 sec count.
The data are still noisy
with no defined baseline and spikes still showing on the peaks but still
usable.
While Sulfur is at 2. so
is Mo La1,2.and in that you have a lot of Mo I¡¯d have to call this Mo La1,2. ?The
¡°P¡± at 2.0 is not on centered on P 2.0 but shifted 5 channels back to 1.87.(this
is why you max the gain resolution to be able to see this stuff) this peak is under
counted and unresolved so to say anything the ¡°peak¡± looks like it could be Mol
at 2.0 trying to come up, but it¡¯s too under countered to say anything about it
on the record.
The Mo binding energy of
Mo is 20keV so a beam 1.5 x that or 10 kV above is about optimal so that¡¯s set
perfect at 27kV, but with that amount of Mo anything would work. Try a shot at 10
or 15 kV and see if 1.8 and 2.3 become better resolved with a better number of
counts
Dud
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