PARTICLE DETECTION AND VERSIONS OF APPLICATIONS IN SECURITY AND PORTAL MONITORING Russian patent published in 2012 - IPC G01T1/20 

FIELD: physics.

SUBSTANCE: in one version, a monitoring system has a cosmic ray-produced charged particle tracker with a plurality of drift cells. The drift cells, which can be for example aluminium drift tubes, can be arranged at least above and below a volume to be scanned so as to track incoming and outgoing charged particles, such as cosmic ray-produced muons, while also detecting gamma rays. The system can selectively detect devices or materials, such as iron, lead, gold and/or tungsten, occupying the volume from multiple scattering of the charged particles passing through the volume and can also detect any radioactive sources occupying the volume from gamma rays emitted therefrom. If necessary, the drift tubes can be sealed to eliminate the need for a gas supply system.

EFFECT: high efficiency of detecting nuclear materials.