Method for detecting particulate radiation

A method of detecting particulate radiation using a semiconductor based pixelated detector, the detector pixels having a detector pixel size, the detector sensitive to the particulate radiation, each particle of the particulate radiation causing a multitude of electron/hole pairs in the semiconductor material of the detector, the multitude of electron/hole pairs having a centroid and a centroid extent, the extent of the centroid extent larger than the detector pixel size, the method comprising:

• intercepting a particle of the particulate radiation,
• estimating the number of electron/hole pairs for a number of adjacent detector pixels,
• estimating the position of the centroid of the number of electron/hole pairs using the estimates of electron/hole pairs in adjacent detector pixels,
• estimating the impact position of the particle using said estimated position of the centroid, said estimated impact position having a position dependent bias depending on the position within the detector pixel,
• forming a pixelated image using the estimated position of a multitude of estimated impact positions, the pixelated image consisting of image pixels having an intensity, and
• adjusting the contribution of each estimated impact position to corresponding image pixels to counter the effect of said position dependent bias within the adjacent detector pixels.