The management of acute radiation syndrome in persons inadvertently ex
posed to total-body irradiation greatly benefits from the experience g
ained in previous clinical management situations. Within the framework
of exposure to high doses, one of the most critical issues is the que
stion of whether hematopoietic stem cell transplantation is indicated.
A valid answer can be given with appropriate accuracy based on a thor
ough analysis and evaluation of all accessible case histories. Based o
n the clinical evaluation of patients severely affected with acute rad
iation syndrome, the following recommendations may be issued. There is
limited indication for stem cell transplantation when there is accomp
anying severe radiation damage to organ systems other than the hematop
oietic system. The optimum duration of pancytopenia can be estimated u
sing the biomathematical model introduced in this article.