At what threshold dose will Hematopoietic Syndrome occur?

Hematopoietic Syndrome, also known as bone marrow syndrome, typically manifests when the whole body is exposed to a dose of radiation that significantly affects the production of blood cells within the bone marrow. The threshold for this syndrome to occur is around 1 Gray (Gy). At or above this exposure level, there is a sufficient reduction in red blood cells, white blood cells, and platelets, leading to the clinical manifestations associated with the syndrome, such as increased susceptibility to infections, anemia, and bleeding disorders.

While higher doses certainly exacerbate the effects and can result in more severe outcomes or additional types of radiation syndromes, the initiation of Hematopoietic Syndrome is recognized to occur at this lower dose threshold. Therefore, 1 Gray (Gy) is correctly identified as the point where significant hematological disturbances begin due to radiation exposure.