A micro-channel plate or micro-sphere plate delay-line detector with multi-hit capability for detecting the position of at least two particles with a mean pulse pair resolution of less than 20 ns, the detector comprising: a secondary electron multiplier in the form of a micro-channel plate or a stack thereof, or a micro-sphere plate or a stack thereof; a delay-line anode which includes at least first, second and third non-parallel conductive members (4a, 4b, 4c), wherein the delay-line anode is mounted behind said secondary electron multiplier for receiving electromagnetic pulses induced on the conductive members (4a, 4b, 4c) caused by electron clouds produced in said secondary electron multiplier in response to said two particles having impinged on the secondary electron multiplier, the electron clouds emerging from the rear side of the secondary electron multiplier, travelling to the delay-line anode and expanding during flight covering a plurality of windings of each of the three conductive members (4a, 4b, 4c), wherein each one of the at least three conductive members (4a, 4b, 4c) having a first and a second terminating end and forming a propagation line for electromagnetic signals for propagating the induced electromagnetic signals along each propagation line with a velocity (vx, vy, vz) close to the speed of light in both directions to the respective first and second terminating ends, wherein all of the six terminating ends are adapted to provide the propagated electromagnetic signals to an electronic analyser for calculating the two-dimensional positions of both of the at least two particles as a function of the arrival times (tx1a, tx1b, tx2a, tx2b, ty1a, ty1b, ty2a, ty2b, tz1a, tz1b, tz2a, tz2b) at the six terminating ends and the propagation velocities (vx, vy, vz) of the induced electromagnetic signals on the propagation lines. a secondary electron multiplier in the form of a micro-channel plate or a stack thereof, or a micro-sphere plate or a stack thereof; a delay-line anode which includes at least first, second and third non-parallel conductive members (4a, 4b, 4c), wherein the delay-line anode is mounted behind said secondary electron multiplier for receiving electromagnetic pulses induced on the conductive members (4a, 4b, 4c) caused by electron clouds produced in said secondary electron multiplier in response to said two particles having impinged on the secondary electron multiplier, the electron clouds emerging from the rear side of the secondary electron multiplier, travelling to the delay-line anode and expanding during flight covering a plurality of windings of each of the three conductive members (4a, 4b, 4c), wherein each one of the at least three conductive members (4a, 4b, 4c) having a first and a second terminating end and forming a propagation line for electromagnetic signals for propagating the induced electromagnetic signals along each propagation line with a velocity (vx, vy, vz) close to the speed of light in both directions to the respective first and second terminating ends, wherein all of the six terminating ends are adapted to provide the propagated electromagnetic signals to an electronic analyser for calculating the two-dimensional positions of both of the at least two particles as a function of the arrival times (tx1a, tx1b, tx2a, tx2b, ty1a, ty1b, ty2a, ty2b, tz1a, tz1b, tz2a, tz2b) at the six terminating ends and the propagation velocities (vx, vy, vz) of the induced electromagnetic signals on the propagation lines.