The Hematopoietic syndrome results when acute whole-body radiation exposure is above: (A) 50 rad, (B) 100 rad, (C) 200 rad, (D) 400 rad
Answer is C. The hematopoietic syndrome results from acute whole-body doses above 200 rads. A prodromal phase consists of nausea and vomiting within the first 12 hrs, with symptoms usually lasting up to 48 hrs. A latent period of 2-3 wks during which patients may feel quite well follows. Although patients are asymptomatic, bone marrow impairment has occurred. The most obvious laboratory finding is lymphocyte depression.