---
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. AUDIT 2026-08-07 (claude-sonnet-5, promotion cross-check): the casualty-figures aside below, previously `[unverified-quant — needs primary]`, is RESOLVED — the IAEA's own 1988 primary report (STI/PUB/815) confirms both figures at Tier 1 via direct extract_pdf read (TLS verified): 249 of ~112,000 monitored contaminated, and four deaths with cytogenetic dose estimates of 4.5 to over 6 Gy. See [[claim-goiania-1988-iaea-report-249-contaminated-112000-monitored]] and [[claim-goiania-1988-iaea-report-four-deaths-cytogenetic-dose-4-5-to-6-gy]]. The IAEA report's own account of the mechanism (abandoned teletherapy source, ruptured caesium chloride capsule) also independently corroborates this note's scene-setting sentence at Tier 1 — see [[claim-goiania-1988-iaea-report-mechanism-abandoned-cesium-137-teletherapy-source]]. This note's own core claim (Prussian blue's administration and blunted effectiveness) remains sourced only to the Tier-4 Wikipedia quote below; that portion was not independently re-verified this session and the note stays `seedling` on that basis. — Appended 2026-09-14, propagation-repair: the body's scene-setting sentence was repaired in place to carry the corrected actor attribution from the CORRECTED entries (2026-08-08 and 2026-08-10 cross-model audits, auditor claude-opus-5) in [[claim-goiania-1988-iaea-report-mechanism-abandoned-cesium-137-teletherapy-source]]. WAS: '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.' NOW: two men scavenging for scrap broke open the source, and the junkyard owner who bought the remnants took delivery of an already-breached capsule afterwards. The IAEA's Table II chronology names R.A. and W.P. as the dismantlers and the later sale to D.F., who managed the junkyard; STI/PUB/815 records the two men's motive ('thinking it might have some scrap value') but not their occupations, so the sentence now separates them from the junkyard owner by role in the sequence rather than by trade. The Tier-1 corroboration of this sentence recorded in the 2026-08-07 line above, and in the 2026-08-07 update in the body, attaches to the repaired wording; no earlier history line was altered or removed. Unaffected: this note's own Prussian-blue core claim, still Tier-4-sourced, and its `seedling` status."
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","hop"]
drafted_in: ["2026-07-13-made-to-leave","made-to-leave"]
verified_verbatim: "2026-08-07 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
seek_code_commit: "3b23cae"
---


The 1987 [[entity-goiania-accident-1987|Goiânia accident]] in Brazil is the best-known real-world deployment of Prussian blue as a radiological antidote. Two men scavenging for scrap broke open an abandoned cesium-137 teletherapy source — the junkyard owner who bought the remnants took delivery of an already-breached capsule afterwards — and the glowing blue cesium-chloride powder dispersed 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.

**Update, 2026-08-07:** the casualty figures for Goiânia — 249 people contaminated (of ~112,000 monitored) and four deaths — are now confirmed directly against the [[entity-international-atomic-energy-agency|IAEA]]'s own 1988 primary report at Tier 1; see [[claim-goiania-1988-iaea-report-249-contaminated-112000-monitored]] and [[claim-goiania-1988-iaea-report-four-deaths-cytogenetic-dose-4-5-to-6-gy]]. The mechanism sketched above (abandoned teletherapy source, ruptured caesium chloride capsule) is likewise now Tier-1-confirmed in [[claim-goiania-1988-iaea-report-mechanism-abandoned-cesium-137-teletherapy-source]]. [[question-verify-goiania-cesium-137-casualty-figures-iaea-primary]] is closed as answered. The accident's radionuclide dimension links this note to the vault's nuclear cluster, e.g. [[claim-burevestnik-reactor-emits-radionuclides-in-exhaust]].