True or false: Neutrons can make other substances radioactive.

Neutrons can indeed induce radioactivity in other substances, which makes the assertion true. This phenomenon occurs because neutrons can collide with nuclei of certain elements, causing them to become unstable. When a neutron is absorbed by a nucleus, it can lead to a transformation where the nucleus emits radiation as it decays, often turning into a different element or isotope in the process.

This capability is particularly significant in nuclear reactions and in the context of neutron activation. For example, neutron activation is a process used in various applications, including the production of radioisotopes for medical use and the analysis of materials. During such interactions, stable isotopes can capture neutrons, resulting in the formation of radioactive isotopes that emit gamma radiation as they decay.

Thus, neutrons can effectively make other substances radioactive, reinforcing the correctness of the statement.