The IAEA's 1988 primary report states four people died in the Goiânia accident, with cytogenetic dose estimates of 4.5 to over 6 Gy

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The IAEA's formal 1988 report on the Goiânia accident, The Radiological Accident in Goiânia (STI/PUB/815), gives both the death count and the dosimetric basis for it. Twenty people were triaged into hospital care; of those, four died within four weeks of admission:

"Four of the casualties died within four weeks of their admission to hospital. The post-mortem examinations showed haemorrhagic and septic complications associated with the acute radiation syndrome. The best independent estimates of the total body radiation doses of these four people, by cytogenetic analysis, ranged from 4.5 Gy to over 6 Gy. Two patients with similar estimated doses survived."

The report's Introduction restates the toll alongside the injury count ("Four of the casualties ultimately died and 28 people suffered radiation burns") — the same document repeating itself, not independent corroboration, but the primary record the figure traces back to. It supplies detail secondary retellings of "four deaths" generally drop: the total-body dose range by cytogenetic analysis, and the fact that two patients with comparable estimated doses survived, which marks the four deaths as sitting near a dose threshold rather than a clean lethal cutoff.

This resolves, for the death count, the same [unverified-quant — needs primary] gap that the contamination count resolved for the screening figures — both were carried by claim-prussian-blue-was-deployed-at-scale-in-the-1987-goiania-cesium-137-accident from a Tier-4 aggregator until this session.