Patent 8076645 was granted and assigned to Riken on December, 2011 by the United States Patent and Trademark Office.
A gamma ray detector is provided that increases a detectable energy range. A position-sensitive gamma ray detecting element for low energy gamma rays 101 that can detect an interaction position and energy of a gamma ray is disposed in front of a pair of position-sensitive gamma ray detecting elements for high energy gamma rays 102 and 103 that can detect an interaction position and energy of a gamma ray.