In theory you can calibrate your line profile and instrumental deviations using a sigle crystal e.g. Si (111). In this case, you will have only one peak (near 28° 2theta for cupper source) and by the FWHM, you can correct the deviations.

If you want to calibrate the XRD equipament, I suggest a manual scan to get the zero of the goniometer. You must see a perfect gaussian on 0° 2theta. Remember to protect the detector, using filters and narrow slits.

Hi Artur,

Thanks for your answer. I completely agree with the point you mentioned. I am going for a multi expose choice i.e will expose the IP to Al and then Cu, hence getting Cu lines as reference and calibrating the specta. 

Cheers,

Rad