I’ve personally seen someone get 7 Gy and be relatively functional (in a localized area) - no worse than he went into the OR anyway, to get the stent put in his brain. And he almost certainly lived another decade or so.
The other stuff sure, but it takes a truly mind boggling amount of radiation to incapacitate someone (near) instantly. A lot more than that.
100-150 Gy? The only concrete number I found looking around for ‘instant’ was 1000 Gy to likely kill someone within an hour.
Here's an IAEA report from an incident where a worker walked into an irradiation room of a commercial irradiator with the radioactive source still up - he was only there for about one minute and received a dose of "only" about 10-20Gy total, but realized something was wrong because of intense pain that developed shortly after entering the room, followed by intense neusea and diarrhea 5 minutes later. Despite receiving urgent care immediately he still died a month later.
It's a fascinating(if very morbid) read if you want to have a look:
Localized exposure is a different story, some body parts can take a lot of radiation. IDK if someone, having just burglarized a live reactor, can keep their exposure localized in a favorable place.
I think incapacitation is what matters. The human body will fight death for some time, but it won't be able to running around with a heavy backpack of fission material. Various tissues will scream bloody hell almost immediately from being torn apart by the radiation.
True, though notably the Chernobyl 'firefighters' were picking up hot chunks of core and fuel from the reactor building roof, and reported at most feeling tired at the time. They did die shortly afterwards, but that was weeks to a month after.
The other stuff sure, but it takes a truly mind boggling amount of radiation to incapacitate someone (near) instantly. A lot more than that.
100-150 Gy? The only concrete number I found looking around for ‘instant’ was 1000 Gy to likely kill someone within an hour.