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The device (1) has a detection unit (38) that is provided for detecting two electromagnetic radiations that are radiated by a light source (10) after partial radiography of a medium with applied magnetic field (44). A determination unit (40) is provided for determining a phase relation between the two detected electromagnetic radiations. An evaluation unit (46) is provided for determining a concentration value of a magneto-optic substance in the medium on the basis of the determined phase relation. Independent claims are also included for the following: (1) a method for determining concentration value of a magneto-optic substance in a medium (2) a computer program product for performing a method for determining concentration value of a magneto-optic substance in a medium.