<div dir="ltr">I got from here <a href="http://webhome.phy.duke.edu/~kolena/hou/counts.html">http://webhome.phy.duke.edu/~kolena/hou/counts.html</a> a formula for the number of counts (c=faqt; where c is the number of counts, f is the photon flux, a is the area, q is the quantum efficiency and t is the exposure time) It is for telescopes but I guess is not a lot different for the detector used in xrc.<div dir="ltr"><br></div><div dir="ltr"><div dir="ltr">Thank you very much. <br></div></div><div dir="ltr"><br></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">El mié., 6 de mar. de 2019 a la(s) 19:20, Johan Hattne (<a href="mailto:hattne@ucla.edu">hattne@ucla.edu</a>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I think that would depend on how the detector is measuring the photons that impinge on it.<br>
<br>
Unless you’re actually concerned with exactly how the detector does its thing, I think Tim’s dimensionless or something fuzzy like “detector unit” is fine.<br>
<br>
// Johan<br>
<br>
> On Mar 6, 2019, at 14:16, Murpholino Peligro <<a href="mailto:murpholinox@gmail.com" target="_blank">murpholinox@gmail.com</a>> wrote:<br>
> <br>
> ...<br>
> The counts are the number of x-ray photons converted to electrons?<br>
> <br>
> <br>
> Thanks<br>
> <br>
> El mié., 6 de mar. de 2019 a la(s) 15:18, Tim Gruene (<a href="mailto:tim.gruene@psi.ch" target="_blank">tim.gruene@psi.ch</a>) escribió:<br>
> Dear Murpholino,<br>
> <br>
> the unit of intensity is '1' - it is the counts on the detector. The scale is <br>
> arbitrary, you can multiply your intensity with any positive number you want, <br>
> as long as you don't create an overflow or underflow in the computer program.<br>
> As long as you do the same with the sigma-values, your refinement should not <br>
> change.<br>
> <br>
> Best regards,<br>
> Tim<br>
> <br>
> On Wednesday, March 6, 2019 10:00:55 PM CET Murpholino Peligro wrote:<br>
> > If I do `phenix.xtriage XDS_ASCII.HKL` I get a log file. In the "Statistics<br>
> > for data merging" of this log file I have:<br>
> > Resolution: 26.02 - 1.40<br>
> > Observations: 44675<br>
> > Unique reflections: 16306<br>
> > Redundancy: 2.7<br>
> > Completeness: 70.37%<br>
> > Mean intensity: 1656.8<br>
> > Mean I/sigma(I): 19.8<br>
> > SigI < 0 (rejected): 644 observations<br>
> > R-merge: 0.027<br>
> > R-meas: 0.032<br>
> > R-pim: 0.017<br>
> > <br>
> > My question is... what units does Mean intensity has?<br>
> > <br>
> > Thanks<br>
> > Ps I am not sure if this has to do with the detector used which was a CCD<br>
> > (type) ADSC QUANTUM 210 (model).<br>
> <br>
> -- <br>
> --<br>
> Tim Gruene<br>
> Head of the Centre for X-ray Structure Analysis<br>
> Faculty of Chemistry<br>
> University of Vienna<br>
> <br>
> Phone: +43-1-4277-70202<br>
> <br>
> GPG Key ID = A46BEE1A<br>
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</blockquote></div>