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Right. Of course, it wasn't like I was discovering anything new. If you follow the mindat link you can see that others have specimens with more distinct crystals of both types. Without the analysis

Correct, George. While this type if analysis is not quantitative, you can get a good idea of what type of crystal(s) you are looking at. Microprobe analyses are quantitative, but require at least a

Interesting report Charles. Such an analysis would be difficult by other means without destroying all or part of the sample?George

I have an interesting specimen from the Spinelli Prospect in CT. It is similar to other specimens reported from this locality. https://www.mindat.org/gallery.php?loc=4565&min=1514 Even though this

Hi Geo, The V (voltage) is the voltage across the 100 ohm termination resistor so the 13 pF per foot of cable capacitance (RG-62) will only increase the RC constant of the input pulse to the the

Don't the cable length/capacitance and input capacitance play into that as well? Geo

Hi Geo, Well for the adapter in #018 alone , Q= C x V If C= 2pF and your pulser output amplitude is say, 100 mV, then the charge equivalent of that 100 mV would be 0.2 pCoul. Of course, the

Haha, yes Titanium replaced lead in paint some time ago evidently. I ran into that even with the NaI(Tl) probe, drove me nuts until determining it was real. Notice in my pictures now, the surface of

Simple is good. Notice the #018 schematic includes the charge sensitive preamplifier adaptor. Does the manual also give the conversion factor formula for milliVolts to Coulombs? Geo>K0FF

Nice detective work. Dud Sent: Friday, March 13, 2020 4:55 PM To: [email protected] Subject: Re: [XRF] DppMCA vs Theremino I was wanting to review the background peaks caused by my Am241 exciter

I was wanting to review the background peaks caused by my Am241 exciter and Pb shield. In the process I moved the detector from a painted window sill (blue) to a bare particle board (green). To my

Hi Geo, OK I understand, no test input to the module. FYI Here are (attached) two versions of simple test pulse input circuits for a PMT application designed to produce about 130 mV at the preamp

Good points Randall, good to hear from you- that can work with Theremino but DppMCA doesn't have a conventional pulse input or even a connector- the sensor is hardwired to the preamplifier and it to

I have mentioned this previously but it seems appropriate to do so again now: A precision pulser such as an Ortec 419 allows the user to dial up a test pulse of Any equivalent energy, once it has

Charles, again your approach to determine what you’re trying to ID is flawed. You’re only looking at what you expect to be in there from what someone told you it is and looking no further.

Geo, The Fe Ka1 is at 6.4, its escape peak should be at 4.66, but there is nothing at 4.66. The peak just left of that has a centriod at 4.5 which would indicate the Ka1 of Ti at 4.5. It’s very

That little region around Si escape peak off Fe is unclear. If there is any Ti it is very minor and is not one of the elements we are looking for to verify this id. George and I were talking about

As long as the calibration is linear, any escape peak from Silicon will be 1.75 keV below a MAJOR peak. The height of that escape peak will be very small compared to the major peak that caused it.

are we talking about a 4.5 keV peak possibly being the Si escape peak of the 6.4 main peak here? I'll put it up and take a look too.Geo