The scale factor depends on the intensity of the incident radiation,
the illuminated
sample volume, and the sample material. So, I don't believe that
varying the mass
of a given sample will cause a different scale factor if:
1. you have selected the correct divergence slit so that you only
illuminate your sample
2. your sample is "infinitely" thick. For Cu K-alpha radiation, the
mass absorption length of Al2O3
is about 93 microns. So, at least 96 % of the incident radiation
that makes it back to the
detector comes from the top 150 microns of your sample.
3. the incident radiation is the same for both samples.
Hope this helps,
David Lee
On Apr 13, 2009, at 5:24 AM, Budi Hartono wrote:
Dear Rietvelders,
I have a case in measurement using conventional XRD. The case is as
follow.
We have a powder consist of one phase (e.g. Al2O3). We will use
conventional XRD. First measurement, we put 0.9 gr in the sample
holder. Then we get the result, and call it as DATA A. Second
measurement, we put 0.8 gr in the sample holder. Then we get the
result, and call it as DATA B.
Without carrying out real measurement, and same instrumental setup
is applied to each measurement, what can we expect about the result
differences (between DATA A and B)? Is it true that we will get
different scale factor?
Thanks for the answers.
With regards,
Budi
