1. An apparatus for estimating a property of an earth formation, the apparatus comprising: a pulsed neutron generator configured to emit a pulse of neutrons, the pulsed neutron generator being disposed on a carrier configured to be conveyed through a borehole penetrating the earth formation; a formation radiation detector configured to detect radiation emitted from the formation due to interactions with the pulse of neutrons; a neutron generator radiation detector comprising a crystal structure and configured to detect a radiation particle emitted from the pulsed neutron generator and to provide a location within the neutron radiation detector at which the particle was detected, the crystal structure comprising a plurality of detection cells, each detection cell comprising at least two electrically conducting columns with an applied potential difference such that electrons generated in the crystal structure by interaction with the radiation particle emitted by the pulse neutron generator are collected by at least one of the electrically conducting columns, wherein the detection cell detecting the radiation particle provides the location; and a processor configured to estimate the property using the radiation detected by the formation radiation detector and locations of radiation particles detected by the neutron generator radiation detector.