Development Of Detection Techniques Of Nuclear And Radioactive Materials For Major Public Events

In order to prevent radiation terrorism at major public events or large-scale commercial buildings, technological improvements for wide area monitoring and detection and localization of radioactive materials are required. JAEA has started developing detection techniques including mapping and imaging method. Recently, mapping technique of radiation dose/count rate using self-location recognition method, such as GPS, has come to be widely used. It is simple and handy method to find a spot that the radiation material would be placed. We have performed some preliminary tests using CsI(Tl) scintillation detector combined a GPS. Also, a gamma-ray camera has potential for prompt localization of the radioactive source, especially if it is required to localize a highly intense source from a distance place. We are investigating a capability of a compact Compton camera under the collaboration with CLADS. In addition, neutron detection method is important for the detection of nuclear materials or particular isotopes like Cf-252 or AmBe source. Basic performance tests of plastic scintillator EJ-276 have been performed at Kindai University. A project overview and preliminary experimental result of Cs(Tl) detector will be presented.