Abstract: The present invention provides a system for detecting explosives, drugs or radioactive or fissile material aboard waterborne vessels. The system includes a linear accelerator mounted on a floating platform such as a ship that directs a photon beam at a target vessel. If the target vessel contains explosives, drugs or radioactive or fissile material the photon beam will induce characteristic neutron radiation from these substances that is picked up by neutron radiation detectors mounted on the floating platform. Neutron radiation induced by the accelerator is detectable even through shielding such as lead. A floatation stabilization system supports the operation of the accelerator and detectors. A data storage system documents radiation data and corresponding identification data for the target vessel and can access a database containing the target vessels cargo manifest. Video cameras may be used to identify the target vessel.

Abstract: A method and apparatus are provided for analyzing the elemental constituents of fluid streams in the cellulose pulp industry, such as liquid with dissolved solids for treatment of cellulose pulp or from the treatment of cellulose pulp, or liquid slurries including comminuted cellulose material. Continuous on-line elemental analyses are made of one or more such fluid streams, and at least the partial elemental make-up (either material, or of elements added for marking) of the streams determined. Then one or more processes for acting on the fluid streams are controlled to optimize the processes as a result of the analyses made. The invention is particularly useful in the continuous on-line analysis of black liquor utilizing prompt gamma neutron activation analysis, and controlling the operation of an evaporator or recovery boiler.