Extreme radioactive exposure on humans

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What would happend oif a human (or anything alive, for that matter), would be exposed to a REALLY massive amount of radioactivity? (like, 1 000 000 sievern)

The difference between the sievert and the gray become moot at such high exposures. Normally, temperature effects don't play a role anywhere near the thresholds for burns and sickness, but at 1 million joules per kg, water would undergo a temperature rise of 240 Celsius if it stays liquid, and this is on top of an initial temperature of about 37 Celsius. Your test human in question is instantly cooked, and will probably explode too because the vapor pressure of water at 277 Celsius is rather high.

There is a technical term for that: cooked.

It would be worse than being broiled in a microwave oven.

ruveyn

You would be vaporized.

I met a man once who was aligning a military radar dish when it was energized, by accident or as a very sick prank (he never knew which). He suffered serious skin burns, but far more serious burns to many internal organs including his intestine and liver. About what you would expect if he had climbed inside a microwave oven and got half-cooked through his mid-riff.

You'd be turned into dust instantly, no human could survive that.