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Dear some of the units used are Grays, Sieverts, rems, and rads. They are used in a similarway, but 0.1 rad is equivalent to 100 Gray.
Below 30 rads: Mild symptoms will occur in the blood
From 30 to 200 rads: The person may become ill.
From 200 to 1,000 rads: The person may become seriously ill.
Over 1,000 rads: This will be fatal
The signs and symptoms of acute
radiation poisoning are:
vomiting,
diarrhea, and nausea
loss of appetite,
malaise, or feeling unwell
headache, rapid heartbeat
A person who is exposed to 3,000 rads will experience nausea and vomiting, and they may experience confusion and a
loss of consciousness within a few hours. Tremors and convulsions will occur 5 to 6 hours after exposure. Within 3 days, there will be coma and death.
I think I answered to your question if you have more questions please feel free to ask.