1. A Device for analysing an object, comprising: a radiation source configured to produce ionizing electromagnetic radiation, the radiation propagating towards a holder, the holder being able to hold the object; a first collimator, placed between the radiation source and the holder, the first collimator having an aperture configured to form a collimated beam propagating along a propagation axis towards the holder; a detector, comprising pixels, each pixel being able to detect ionizing electromagnetic radiation and to form therefrom an energy spectrum; a second collimator, placed between the holder and the detector, the second collimator being configured to selectively direct radiation emitted by the object, which is held by the holder, towards said detector, depending on a scattering angle of the radiation emitted by the object; wherein the second collimator extends, between a first end and a second end, around a central axis, the second collimator including a plurality of channels, each channel being bounded by lateral walls, the second collimator being such that: each channel has a median axis, the median axis extending, in the centre of the channel, between said lateral walls bounding the channel; the median axis of each channel makes an acute angle, called the collimating angle of the channel, with the central axis of the second collimator; each channel being associated to a point, called the focal point, formed by an intersection between the median axis of the channel and the central axis of the second collimator; the second collimator including at least two channels, the collimating angles of which are different, the focal points respectively associated with these channels being different and spaced apart from each other along the central axis of the second collimator; such that each channel transmits to the detector a radiation emitted by an elementary volume of the object, which is placed on the holder, extending around a focal point defined by the second collimator, in a preset angular range.