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They say it is a “counting” christal, so it will not work to do Gamma Spectrometry.
With a counting christal you could only use this christal as a geiger tube, that is more cheap and simple to connect.

But someone says that it could work with a large FWHM, so you could try.
Read the MCA app instructions and try yourself.
We can not help because we never tested this chrystal.

Best regards