Neutron induced break-points in human chromosomes have a similar location as X-ray induced break-points.

The distribution of chromosome breakage points in human chromosomes was studies in lymphocytes irradiated in the G0-period with fast neutrons. With the G-banding technique the break points were located in the pale bands, in agreement with the observation in X-irradiated chromosomes. When lymphocytes from the same donor were used, the individual chromosomes were found to participate in chromosome interchanges in the same non-random way as after X-irradiation. The results also indicate that for different donors different chromosomes are more susceptible to neutron-induced chromosome breakage.