Acute Dose Needed to cause Organ-Based Syndromes:

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    Hematopoietic (Bone Marrow) - one to six Gray (Gy) (100-600 rad)
    Gastrointestinal (GI) > ten Gy (1000 rad)
    Central Nervous System (CNS) - over 50 Gy (> 5000 rad)

    Remember: doses over 450 rad (4.5 Gy) will kill most humans without prompt medical treatment.


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