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[57] ABSTRACT A sample (1) is irradiated by a pulse from a laser (2), creating? uorescence radiation, which is brought. in imaging relation or otherwise, to a detector (6) sensing from the same sample (1) in a plurality of spectral inter vals (6A-6D), for obtaining intensity values. The radia tion may be sensed in imaging relation, creating a multi plicity of said pluralities. The spectral intervals may be wavelength de? ned by passband? lters (SA-5D) or time interval de? ned time spectral intervals controlled by a computer (7), which makes a numerical evaluation com prising a division. The tissue character may then be evaluated from the evaluation.