One of the few, who actually died of radiation.
Radiation is actually quite safe, but Slotin got like 10 Sv.
Definitely too much. But his colleagues, who were just few feet away all survived.
Unfortunately, few accidents like this generate the anti-radiation hysteria, we are all experiencing.
A lot more people die falling from ladders every year than all people died of radiation, ever!
Are you counting Hiroshima and Nagasaki?
Of the flip side of radiation exposure, see the story of Albert Stevens, house painter from Ohio and the most radioactive person ever!
https://en.wikipedia.org/wiki/Albert_Stevens
He was mistakenly injected massive dose of radioactive plutonium, but lived healthy life, with no apparent effects of radiation exposure, ever.
Stevens died of heart disease some 20 years later, having accumulated an effective radiation dose of 64 Sv (6400 rem) over that period, i.e. an average of 3 Sv per year or 350 μSv/h.
Slotin got only like 10 Sv! 6x less, but in an instant!
The theory of accumulative radiation is more-less proven wrong, there is great evidence that body heal itself over time from the exposure. Stevens is the best example! He would not survived 64Sv dose given in single short exposure!