NRCan X-Ray Fluorescence (XRF) Analyzer Operator Certification Level 1 Practice Exam

Neutrons arise from processes where nuclei release particles in specific reactions. Some radioactive elements can undergo spontaneous fission, which emits neutrons directly. In nuclear reactors, fissile nuclei like uranium-235 split when they capture a neutron, producing energy and several neutrons that continue the reaction. In particle accelerators, high-energy collisions with heavy targets (spallation and related reactions) knock neutrons out of nuclei. This combination—natural fission decays, reactor fission, and accelerator-driven reactions—is why the statement listing these production pathways is the correct choice. The other statements don’t fit: neutrons are neutral, not positively charged; vacuum isn’t a meaningful medium to absorb neutrons, and neutrons do have mass (about the same as a proton).