Gray 0.7 Gy

Gray 0.7 Gy (> 70 rads) (mild symptoms may occur as low as 0.3 Gy or 30 rads)    • Symptoms are anorexia, nausea and vomiting. • Onset occurs 1 hour to 2 days after exposure. • Stage lasts for minutes to days. • Stem cells in bone marrow are dying, although patient may appear and feel well. • Stage lasts 1 to 6 weeks. • Symptoms are anorexia, fever, and malaise. • Drop in all blood cell counts occurs for several weeks. • Primary cause of death is infection and hemorrhage. • Survival decreases with increasing dose. • Most deaths occur within a few months after exposure. • in most cases, bone marrow cells will begin to repopulate the marrow. • There should be full recovery for a large percentage of individuals from a few weeks up to two years after exposure. • death may occur in some individuals at 1.2 Gy (120 rads). • the LD50/60† is about 2.5 to 5 Gy (250 to 500 rads)