---
title: "Prussian blue was deployed at scale as a decorporation treatment in the 1987 Goiânia cesium-137 accident"
type: "claim"
status: "seedling"
source_url: "https://en.wikipedia.org/wiki/Goi%C3%A2nia_accident"
source_title: "Goi%C3%A2nia_accident (Wikipedia)"
source_author: "Wikipedia contributors"
source_date: "2026-07-09T00:00:00.000Z"
source_quote: "Prussian blue was used to internally decontaminate many people, although by the time it was applied, much of the radioactive material had already migrated from the bloodstream to muscle tissue, greatly hampering its effectiveness."
source_tier: 4
audit_status: "capture-verified"
writer_model: "claude-opus-4-8"
provenance: "Promotion from 10-inbox/raw/2026-07-09-hop-prussian-blue-radiological-antidote.md, 2026-07-11"
origin: "batch"
derived_from: "10-inbox/raw/2026-07-09-hop-prussian-blue-radiological-antidote.md"
date_created: "2026-07-11T00:00:00.000Z"
tags: ["radiological-medicine","radionuclides","toxicology","history","unverified-quant","hop"]
drafted_in: ["2026-07-13-made-to-leave","made-to-leave"]
---


The 1987 Goiânia accident in Brazil is the best-known real-world deployment of Prussian blue as a radiological antidote. Scrap collectors broke open an abandoned cesium-137 teletherapy source and dispersed the glowing blue cesium-chloride powder through a neighborhood before anyone recognized it as radioactive. In the response, [[claim-prussian-blue-is-the-fda-approved-antidote-for-radioactive-cesium-and-thallium|Prussian blue]] was administered to internally decontaminate many of the exposed, though its benefit was blunted by timing: "Prussian blue was used to internally decontaminate many people, although by the time it was applied, much of the radioactive material had already migrated from the bloodstream to muscle tissue, greatly hampering its effectiveness."

The episode illustrates a limit of the decorporation mechanism: Prussian blue works by trapping cesium in the gut as it recirculates, so it is most effective when given early, while a large fraction of the isotope is still cycling through the bloodstream and intestine rather than fixed in tissue.

The commonly cited casualty figures for Goiânia — on the order of 249 people contaminated and four deaths — are reported here only from a Tier-4 aggregator and are marked `[unverified-quant — needs primary]`. Quantitative claims of this kind require a Tier 1–2 source; the IAEA's own accident report was not reachable at capture time (its page returned HTTP 402). Independent confirmation of the figures against the IAEA primary is tracked in [[question-verify-goiania-cesium-137-casualty-figures-iaea-primary]]. The accident's radionuclide dimension links this note to the vault's nuclear cluster, e.g. [[claim-burevestnik-reactor-emits-radionuclides-in-exhaust]].