A method for identifying a moving radiation source by a radiation portal monitoring system is described. The radiation portal monitoring system includes a radiation portal monitor with a plurality of radiation detectors configured to detect ionizing radiation of the radiation source and to generate a detection signal responsive to detection of the ionizing radiation, and at least one processor executing the steps of providing an identification machine learning model; receiving labelled static identification training data generated by radiation detection of a plurality of known static radiation sources; introducing to the static identification training data modifications representing detection signal alterations caused by radiation source movement through the radiation portal monitor to obtain pseudo-dynamic identification training data; training the identification machine learning model using the pseudo-dynamic identification training data; and identifying the moving radiation source from the detection signal using the trained identification machine learning model.

A method for identifying a moving radiation source by a radiation portal monitoring system is described. The radiation portal monitoring system includes a radiation portal monitor with a plurality of radiation detectors configured to detect ionizing radiation of the radiation source and to generate a detection signal responsive to detection of the ionizing radiation, and at least one processor executing the steps of providing an identification machine learning model; receiving labelled static identification training data generated by radiation detection of a plurality of known static radiation sources; introducing to the static identification training data modifications representing detection signal alterations caused by radiation source movement through the radiation portal monitor to obtain pseudo-dynamic identification training data; training the identification machine learning model using the pseudo-dynamic identification training data; and identifying the moving radiation source from the detection signal using the trained identification machine learning model.

A scanning and imaging apparatus comprises a ray source configured to generate an X-ray and a detection device configured to receive an X-ray transmitted through an inspected object, wherein the ray source is configured to image the inspected object by emitting the X-ray to the inspected object. A radioactivity detector is configured to detect whether the inspected object comprises radioactive material synchronously with the process of scanning implemented by the scanning and imaging apparatus. In a case that the radioactivity detector detects radioactive material, an actual position of the radioactive material in an X-ray image of the inspected object obtained by the scanning and imaging apparatus is marked in the image. The above solutions improve the accuracy of displaying the position of the radioactive source in the X-ray image. Further, inspection of radioactive material can be implemented while scanning an image.

Techniques, systems and apparatus are described for operating a multimode passive detection system (MMPDS). A multimode passive detection system includes charged particle tracking detectors to measure cosmic ray-based charged particle trajectories in a volume of interest. The multimode passive detection system includes fission product detectors to detect cosmic ray-based charged particle induced fission in a fissile material present in the volume of interest.

Techniques, systems, and devices are disclosed for constructing a scattering and stopping relationship of cosmic-ray charged particles (including cosmic-ray electrons and/or cosmic-ray muons) over a range of low-atomic-mass materials, and to detect and identify content of a volume of interest (VOI) exposed to cosmic-ray charged particles based on the constructed scattering and stopping relationship. In one aspect, a process for constructing a scattering-stopping relationship for a range of low-density materials exposed to cosmic-ray charged particles is disclosed. This technique first determines a scattering parameter and a stopping parameter for each material within the range of low-density materials exposed to charged particles from cosmic ray. The technique then establishes a scattering-stopping relationship of cosmic ray charged particles for the range of low-density materials based on the determined pairs of scattering and stopping parameters associated with the range of low-density materials.

The present application discloses a detector module, which is arranged on a detector arm, comprising one or a plurality of detector units arranged in a scattered configuration, wherein each of the detector units in the detector module is installed aiming at a beam center of a ray source, thus improving imaging quality and reducing the size of a detector frame drastically.

A method and device for detecting radioactive sources is disclosed. In one aspect, an example method includes measuring, by a detector, a count rate curve of an inspection object while the inspection object moves through the detector. Pattern recognition is performed on the count rate curve. Whether there are radioactive sources in the inspection object is determined according to a result of the pattern recognition, and if there are radioactive sources in the inspection object, a type of the radioactive sources is determined.

A method for determining neutron flux by utilizing a portable Radionuclide Identification Device (RID) as it is used in homeland security applications is provided. The RID has an inorganic crystal comprising iodine, a light detector and electronics for the evaluation of the output signals of the light detector. The method includes a step of detecting, with the light detector, light emitted by the crystal following the interaction of nuclear radiation with the crystal. The intensity of the light measured is a function of the energy deposed in the crystal by said nuclear radiation during the interaction with the crystal.

A method for determining neutron flux by utilizing a portable Radionuclide Identification Device (RID) as it is used in homeland security applications is provided. The RID has an inorganic crystal comprising iodine, a light detector and electronics for the evaluation of the output signals of the light detector. The method includes a step of detecting, with the light detector, light emitted by the crystal following the interaction of nuclear radiation with the crystal. The intensity of the light measured is a function of the energy deposed in the crystal by said nuclear radiation during the interaction with the crystal.

An example method for identifying anomalous radiation measurements acquired in a geographic region can include receiving a radiation measurement for a location within the geographic region, where the radiation measurement is associated with location and time data. The method can also include calculating a background radiation measurement for the location, as well as an expected variation in the background radiation measurement, using a spatial-spectral-temporal database that includes a plurality of radiation measurement records for the geographic region. Each of the radiation measurement records can include a respective radiation measurement that is associated with location and time data. The method can further include comparing the radiation measurement with the background radiation measurement and the expected variation, and determining whether the radiation measurement is anomalous based on the comparison.