Dose of radiation during whole body exposure that leads to haematological syndrome is:

A i.e. 2 Gy Total (whole) body irradiation dose > 1 to 2.5 Gy predominatly leads to hematopoietic syndromeQ; dose 5 to 8 Gy predominantly leads to gastrointestinal syndromeQ and doses 20 to 50Gy predominantly leads to cardiovascular syndromeQ.