Patent ID: 7279683
Filing Date: 2007-10-09
Classification: G01T

Abstract:
1. A distance measurement apparatus of an X-ray or gamma ray source using a multilayered radiation detector, comprising: A plurality of detection plates which disposed along a normal direction and which generate signals on the basis of interaction with incident X-ray or gamma ray photons; A number count unit which counts each number of the X-ray or gamma ray photons having a predetermined energy and interacting with each of the plurality of detection plates based on the signals generated by each of the plurality of the detection plates; and A distance calculation unit which calculates a distance between the distance measurement apparatus and the X-ray or gamma ray source on the basis of statistical analysis by using each number of the X-ray or gamma ray photons concerning only with photoelectric absorption detected by each of the plurality of detection plates and using each interval distance between the plurality of detection plates.