Device for analysing an object, including: - a radiation source able to produce ionizing electromagnetic radiation, the radiation propagating towards a holder (10 s) able to receive the object; - a first collimator, placed between the radiation source and the holder (10 s), the first collimator having an aperture able to form a collimated beam (12 c) propagating along a propagation axis (12 z) towards the holder (10 s); - a detector, comprising pixels (20 i,j, 20* kl), each pixel being able to detect ionizing electromagnetic radiation and to form therefrom an energy spectrum S i, j E, S k, l E; - a second collimator, placed between the holder (10 s) and the detector, the second collimator being able to selectively direct radiation emitted (14 n) by said object, which is held by the holder (10 s), towards the detector, depending on a scattering angle (θ n) of said radiation (14 n) emitted by the object; characterized in that the second collimator extends, between a first end and a second end, around a central axis, the second collimator including a plurality of channels (42 n), each channel being bounded by lateral walls (41 n-1, 41 n), the second collimator being such that: - each channel (42 n) has a median axis (44 n), the median axis extending, in the centre of the channel, between said lateral walls bounding the channel; - the median axis of each channel (42 n) makes an acute angle (θ n), called the collimating angle of the channel, with the central axis of the collimator; - with each channel (42 n) is associated a point (P n), called the focal point, formed by an intersection between the median axis (44 n) of said channel and said central axis of the collimator; the second collimator including at least two channels (42 n, 42 n '), the collimating angles (θ n, θ n ') of which are different, the focal points (P n, P n ') respectively associated with these channels being different and spaced apart from each other along said central axis such that each channel (42 n) transmits to the detector radiation (14 n) emitted by an elementary volume (V n) of the object, which is placed on the holder, extending around a focal point (P 1...P N) defined by the second collimator, in a preset angular range (Δθ n). - a radiation source able to produce ionizing electromagnetic radiation, the radiation propagating towards a holder (10 s) able to receive the object; - a first collimator, placed between the radiation source and the holder (10 s), the first collimator having an aperture able to form a collimated beam (12 c) propagating along a propagation axis (12 z) towards the holder (10 s); - a detector, comprising pixels (20 i,j, 20* kl), each pixel being able to detect ionizing electromagnetic radiation and to form therefrom an energy spectrum S i, j E, S k, l E; - a second collimator, placed between the holder (10 s) and the detector, the second collimator being able to selectively direct radiation emitted (14 n) by said object, which is held by the holder (10 s), towards the detector, depending on a scattering angle (θ n) of said radiation (14 n) emitted by the object; - each channel (42 n) has a median axis (44 n), the median axis extending, in the centre of the channel, between said lateral walls bounding the channel; - the median axis of each channel (42 n) makes an acute angle (θ n), called the collimating angle of the channel, with the central axis of the collimator; - with each channel (42 n) is associated a point (P n), called the focal point, formed by an intersection between the median axis (44 n) of said channel and said central axis of the collimator;