A non-invasive sensor for detecting hazardous materials in the aquatic environment

Current methods for detecting hazardous objects in aquatic environments are primarily based on the use of sonar and magnetometers, which allow for determining the density distribution and shapes of the objects being examined, but do not allow for their identification. Therefore, the detection of any suspicious object requires additional verification by a diver or an underwater vehicle such as an ROV. This usually involves taking samples and analyzing them in a laboratory, which increases costs and extends the time required to survey the seabed (or, for example, to clear it of mines). Devices based on the analysis of the stoichiometry of the substance under investigation using neutrons do not have the limitations of the methods mentioned above. They allow for remote and non-invasive identification. The solution being developed in this project will enable non-invasive detection and identification of the chemical composition of substances underwater without the need for sampling. Detection can also take place through the hulls of ships, and the device can also be used to protect critical infrastructure at sea. It is based on activation by fast neutrons, and the use of air guides for neutrons and gamma rays prevents absorption and slowing of neutrons in water, as well as the scattering of gamma rays. This allows work to be conducted at a distance of up to 50 cm from the object being examined and enables the search for hazardous materials buried in the seabed, while significantly reducing scanning time.