Neutron generators with an external target at the remote end of the neutron tube ion guide

The article reviews the development of neutron generators with a neutron target located at the end of a thin needle ion-guide applicator. This design allows a source of fast neutrons to be inserted directly into the volume of the irradiated object. Generators of this type are used for research of small-sized nuclear reactors. Another area of their use is intracavitary brachytherapy. In this case, the irradiation target is delivered directly to the patient’s tumor through the body’s natural cavities. The article reviews a TGI94 neutron generator for the inspection of small-sized space reactors and an NG-20 generator for radiation therapy of cancer patients.