I have a Fischione Model 3000 detector with inner and outer diameters 4 and 28 mm respectively
The collection angle will depend not only on the physical dimension of your detector but how large your diffraction pattern is relative to it. This is usually expressed via the so-called camera length, the value of which you can adjust in diffraction mode by varying the current through one or several of the intermediate projector lenses. So you need a material of known structure and orientation, like Au(001) or Si(110), and for each camera length record 2 diffraction patterns, one without and with the annular detector inserted. You can then calibrate the size of the hole (inner radius = inner detection angle) for each camera length using Bragg's law. If you are careful you will realise that the hole does often not appear perfectly round because the detector housing is a wedge and it is difficult to align correctly mechanically to high precision (and the projection of a skewed circle is an ellipse).
Thanks a lot for your answer!
I did as you said and got collection angle values
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