[UpAllNight]

--(Radiation workers in the US seldom get 100mrem/yr above background), but radiation sickness requires about double that dose to be in evidence.--

Radiation sickness requires about 500 times that amount and in a much shorter (acute dose) time period.

[AFPhys]

Sorry, that sentence was long, and I didn't notice that my editing left a period in the middle of the sentence instead of a comma, or I could have left out all punctuation marks. Corrected, it should read:

"If you were to get dose of 30,000mrem, it is possible that a sophisticated blood test could detect that you were exposed to radiation, (Radiation workers in the US seldom get 100mrem/yr above background), but radiation sickness requires about double that dose to be in evidence.

That puts us in substantial agreement, leaving me to say that radiation sickness requires about 60,000mrem ... which is, as you say, about 500 times the annual dose allowed for radiation workers in the US.

Thank you for clarifying that such a dose has to be inflicted in a short time period to produce radiation sickness.