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Goiânia accident

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The Goiânia accident [ɡojˈjɐniɐ] was a radioactive contamination accident that occurred on September 13, 1987, in Goiânia, Goiás, Brazil, after an unsecured radiotherapy source was stolen from an abandoned hospital site in the city. It was subsequently handled by many people, resulting in four deaths. About 112,000 people were examined for radioactive contamination and 249 of them were found to have been contaminated.[1][2]

Goiânia accident
A photograph of the radioactive source involved in the 1987 accident.
DateSeptember 13, 1987; 37 years ago (1987-09-13)
LocationGoiânia, Goiás, Brazil
Coordinates16°40′29″S 49°15′51″W / 16.6746°S 49.2641°W / -16.6746; -49.2641 (Instituto Goiano de Radioterapia)
TypeRadiation accident
CauseRadiation source left unsecured by authorities
Participants
  • Maria Gabriela Ferreira
  • Devair Alves Ferreira
  • and other relatives
OutcomeINES Level 5 (accident with wider consequences)
Deaths4
Non-fatal injuries249 contaminated
A typical teletherapy radiation capsule is composed of the following:
  1. a sealed outer protective casing (usually lead),
  2. a retaining ring, and
  3. a teletherapy "source" (diameter in this diagram is 30 mm), composed in turn of
  4. two nested stainless steel canisters welded to
  5. two stainless steel lids surrounding
  6. a protective internal shield (usually uranium metal or a tungsten alloy), and
  7. a cylinder of radioactive source material (caesium-137 in the Goiânia incident, but usually cobalt-60)

In the consequent cleanup operation, topsoil had to be removed from several sites, and several houses were demolished. All the objects from within those houses, including personal possessions, were seized and incinerated. Time magazine has identified the accident as one of the world's "worst nuclear disasters" and the International Atomic Energy Agency (IAEA) called it "one of the world's worst radiological incidents".[3][4]

Description of the source

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See also: Caesium-137 § Incidents and accidents

The radiation source in the Goiânia accident was a small capsule containing about 93 grams (3.3 oz) of highly radioactive caesium chloride (a caesium salt made with a radioisotope, caesium-137) encased in a shielding canister made of lead and steel. The source was positioned in a container of the wheel type, where the wheel turns inside the casing to move the source between the storage and irradiation positions.[1]

 
A wheel type radiotherapy device which has a long collimator to focus the radiation into a narrow beam. The caesium chloride radioactive source is the blue rectangle, and gamma rays are represented by the beam emerging from the aperture.
Comparison of radioactivities
Goiânia source (TBq)
1971 74
1987 50
 .9
Recovered 44
Unrecovered (c. 1987) 7
Unrecovered (c. 2016) 3
 .5
Smoke detector 0
 .000000037

The activity of the source was 74 terabecquerels (TBq) in 1971. The International Atomic Energy Agency (IAEA) describes the container as an "international standard capsule". It was 51 millimeters (2 inches) in diameter and 48 mm (1.8 inches) long. The specific activity of the active solid was about 814 TBq·kg−1 of caesium-137, an isotope whose half life is 30 years. The dose rate at one meter from the source was 4.56 grays per hour (456 rad·h−1). While the serial number of the device was unknown, hindering the ability to verify its identity, the device was thought to have been made in the U.S. at Oak Ridge National Laboratory as a radiation source for radiation therapy at the Goiânia hospital.[1]

The IAEA states that the source contained 1,375 Ci (50.9 TBq) when it was taken and that about 44 TBq (1,200 Ci) of contamination had been recovered during the cleanup operation. This means that 7 TBq (190 Ci) remained in the environment; it would have decayed to about 3.5 TBq (95 Ci) by 2016.

Events

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Hospital abandonment

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The Instituto Goiano de Radioterapia (IGR), a private radiotherapy institute in Goiânia,[1] was one kilometre (0.6 mi) northwest of Praça Cívica, the administrative center of the city. When IGR moved to its new premises in 1985, it left behind a caesium-137-based teletherapy unit purchased in 1977.[5] The fate of the abandoned site was disputed in court between IGR and the Society of Saint Vincent de Paul, then owner of the premises.[6] On September 11, 1986, the Court of Goiás stated it had knowledge of the abandoned radioactive material in the building.[6]

Four months before the theft, on May 4, 1987, Saura Taniguti, then director of Ipasgo, the institute of insurance for civil servants, used police force to prevent one of the owners of IGR, Carlos Figueiredo Bezerril, from removing the radioactive material that had been left behind.[6] Figueiredo then warned the president of Ipasgo, Lício Teixeira Borges, that he should take responsibility "for what would happen with the caesium bomb".[6] The Court of Goiás posted a security guard to protect the site.[7] Meanwhile, the owners of IGR wrote several letters to the National Nuclear Energy Commission (CNEN), warning them about the danger of keeping a teletherapy unit at an abandoned site, but they could not remove the equipment on their own once a court order prevented them from doing so.[6][7]

Theft of the source

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On September 13, 1987, the guard tasked with protecting the site did not show up for work. Roberto dos Santos Alves and Wagner Mota Pereira illegally entered the partially demolished IGR site.[7] They partially disassembled the teletherapy unit and placed the source assembly in a wheelbarrow to later take to Roberto's home. They thought they might get some scrap value for the unit.[1] They began dismantling the equipment. That same evening, they both began to vomit due to radiation sickness.[clarification needed] The following day, Pereira began to experience diarrhea and dizziness, and his left hand began to swell. He later developed a burn on his hand in the same size and shape as the aperture, and he underwent partial amputation of several fingers.[8]

On September 15, Pereira visited a local clinic, where he was diagnosed with a foodborne illness; he was told to return home and rest.[1] Roberto, however, continued with his efforts to dismantle the equipment and eventually freed the caesium capsule from its protective rotating head. His prolonged exposure to the radioactive material led to his right forearm becoming ulcerated, requiring amputation on October 14.[9]

Opening the capsule

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On September 16, Roberto punctured the capsule's aperture window with a screwdriver, allowing him to see a deep blue light coming from the tiny opening he had created.[1] He inserted the screwdriver and successfully scooped out some of the glowing substance. Thinking it was perhaps a type of gunpowder, he tried to light it, but the powder would not ignite.

The exact mechanism by which the blue light was generated was not known at the time the IAEA report of the incident was written, though it was thought to be either ionized air glow, fluorescence, or Cherenkov radiation associated with the absorption of moisture by the source; a similar blue light was observed in 1988 at Oak Ridge National Laboratory in the United States during the disencapsulation of a caesium-137 source.[1]

Source is sold and dismantled

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On September 18, Roberto sold the items to a nearby scrapyard. That night, Devair Alves Ferreira, the owner of the scrapyard, noticed the blue glow from the punctured capsule. Thinking the capsule's contents were valuable or supernatural, he immediately brought it into his house. Over the next three days, he invited friends and family to view the strange glowing powder.

On September 21, at the scrapyard, one of Ferreira's friends (identified as "EF1" in the IAEA report) freed several rice-sized grains of the glowing material from the capsule using a screwdriver. Ferreira began to share some of them with various friends and family members. That same day, his wife, 37-year-old Maria Gabriela Ferreira, began to fall ill. On September 25, 1987, Devair Ferreira sold the scrap metal to a third scrapyard.

Ivo and his daughter

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The day before the sale to the third scrapyard, on September 24, Ivo, Devair's brother, successfully scraped some additional dust out of the source and took it to his house a short distance away. There he spread some of it on the concrete floor. His six-year-old daughter, Leide das Neves Ferreira, later ate an egg sandwich while sitting on the floor. She was also fascinated by the blue glow of the powder, applying it to her body and showing it off to her mother. The egg sandwich was also exposed to dust from the powder; Leide absorbed 1.0 GBq and received a total dose of 6.0 Gy, a fatal dose for which medical intervention was ineffective.[10][11][12]

Maria Gabriela Ferreira notifies authorities

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Maria Gabriela Ferreira had been the first to notice that many people around her had become severely ill at the same time.[13] On September 28, 1987 – fifteen days after the item was found – she reclaimed the materials from the rival scrapyard and transported them to a hospital.

Source's radioactivity is detected

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In the morning of September 29, a visiting medical physicist[14] used a scintillation counter to confirm the presence of radioactivity and persuaded the authorities to take immediate action. The city, state, and national governments were all aware of the incident by the end of the day.

Health outcomes

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News of the radiation incident was broadcast on local, national, and international media. Within days, nearly 130,000 people in Goiânia flooded local hospitals, concerned that they might have been exposed.[2] Of those, 249 were indeed found to be contaminated – some with radioactive residue still on their skin – through the use of Geiger counters.[2] Eventually, twenty people showed signs of radiation sickness and required treatment.[2]

Fatalities

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Ages in years are given, with dosages listed in grays (Gy).

  • Admilson Alves de Souza, aged 18 (5.3 Gy), was an employee of Devair Ferreira who worked on the radioactive source. He developed lung damage, internal bleeding, and heart damage, and died October 28, 1987.
  • Leide das Neves Ferreira, aged 6 (6.0 Gy), was the daughter of Ivo Ferreira. When an international team arrived to treat her, she was discovered confined to an isolated room in the hospital because the staff were afraid to go near her. She gradually experienced swelling in the upper body, hair loss, kidney and lung damage, and internal bleeding. She died on October 23, 1987, of "septicemia and generalized infection" at the Marcilio Dias Navy Hospital, in Rio de Janeiro.[15] She was buried in a common cemetery in Goiânia, in a special fiberglass coffin lined with lead to prevent the spread of radiation. Despite these measures, news of her impending burial caused a riot of more than 2,000 people in the cemetery on the day of her burial, all fearing that her corpse would poison the surrounding land. Rioters tried to prevent her burial by using stones and bricks to block the cemetery roadway.[16] She was buried despite this interference.
  • Maria Gabriela Ferreira, aged 37 (5.7 Gy), wife of scrapyard owner Devair Ferreira, became sick about three days after coming into contact with the substance. Her condition worsened, and she developed hair loss and internal bleeding, especially of the limbs, eyes, and digestive tract. She suffered mental confusion, diarrhea, and acute renal insufficiency before dying on October 23, 1987, the same day as her niece, of "septicemia and generalized infection",[15][17] about a month after exposure.
  • Israel Batista dos Santos, aged 22 (4.5 Gy), was also an employee of Devair Ferreira who worked on the radioactive source primarily to extract the lead. He developed serious respiratory and lymphatic complications, was eventually admitted to the hospital, and died six days later on October 27, 1987.

Devair Ferreira survived despite receiving 7 Gy of radiation. He died in 1994 of cirrhosis aggravated by depression and binge drinking.[18] Ivo Ferreira died of emphysema in 2003.[19]

Other individuals

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The outcomes for the 46 most contaminated people are shown in the bar chart below. Several people survived high doses of radiation. This is thought in some cases to be because the dose was fractionated.[1] Given time, the body's repair mechanisms will reverse cell damage caused by radiation.[20] If the dose is spread over a long time period, these mechanisms can mitigate the effects of radiation poisoning.[20]

Barchart showing the outcome for the 46 most contaminated people for whom a dose estimate has been made. The people are divided into seven groups according to dose. 
Barchart showing the outcome for the 46 most contaminated people for whom a dose estimate has been made. The people are divided into seven groups according to dose.

Other affected people

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Afterwards, about 112,000 people were examined for radioactive contamination; 249 were found to have significant levels of radioactive material in or on their body.[1] Of this group, 129 people had internal contamination. The majority of the internally contaminated people only suffered small doses (< 50 mSv, corresponding to less than about 1 in 200 excess risk of developing cancer later in life[21]). A thousand people were identified as having suffered a dose which was greater than one year of background radiation; it is thought that 97% of these people had a dose of between 10 and 200 mSv (between 1 in 1,000 and 1 in 50 excess risk of developing cancer as a result[21]).

In 2007, the Oswaldo Cruz Foundation determined that the rate of caesium-137 related diseases are the same in Goiânia accident survivors as they are in the population at large. Nevertheless, compensation is still distributed to survivors, who suffer radiation-related prejudices in everyday life.[22]

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In addition to a public civil action for damages to the environment that was brought in September 1995 by the Federal Public Prosecution Service (Department of Justice), together with the State of Goiás’ Public Prosecution Service, before the 8th Federal Court of Goiânia, legal proceedings were also brought against the Federal Union; the National Nuclear Energy Commission; the State of Goiás (through its Health Department); the Social Security Institute for Civil Servants in the State of Goiás – IPASGO, which at the time of the accident was the private owner of the land where the IGR was located; the four medical doctors who owned IGR; and the clinic’s physicist, who was also the supervisor.

On March 17, 2000, the 8th Federal Court of Goiás ordered the defendants to pay compensation of R$1.3 million (near US$750,000) to the Defence of the Diffused Rights Fund, a federal fund for the compensation of damage to the environment, consumers, property and rights of artistic, historic, or cultural value and other collective rights.

In his sentence, the Judge excluded the state of Goiás and the Federal Union from the payment of compensation.

The CNEN was ordered to pay compensation of R$1 million, to guarantee medical and psychological treatment for the direct and indirect victims of the accident and their descendants down to the third generation, to provide transportation to medical exams for the most serious victims, and was responsible for the medical follow-up for the people of Abadia de Goiás city.

The Social Security Institute for Civil Servants in the State of Goiás, IPASGO, was ordered to pay a fine of R$100 000, plus interest as of 13 September 1987, the date of removal of the caesium-137 capsule.

As the accidents occurred before the promulgation of the Federal Constitution of 1988 and because the substance was acquired by the clinic and not by the individual owners, the court could not declare the owners of IGR liable. However, one of the owners was fined R$100 000 because he was found liable for the abandoned state of the IGR building where the caesium source was kept, including the removal of gates, windows, timberwork and the roof in May 1987.

The clinic’s physicist was also fined R$100 000 because he was the technician responsible for the control of the medical manipulation of the radiological device.

Although the two thieves were not included as defendants in the public civil suit, the judgement of the court found them directly responsible for the accident. If they had been arraigned as defendants, they certainly would have been convicted, as their actions led to strict (no-fault) liability. However, in terms of criminal intent, they were not aware of the seriousness of their actions in removing the caesium source from its location, and they had no knowledge of the dangers of the radiological device; moreover, there was no danger sign erected in the abandoned clinic in order to ward off intruders.[23]

Cleanup

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Objects and places

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Topsoil had to be removed from several sites, and several houses were demolished. All the objects from within those houses were removed and examined. Those that were found to be free of radioactivity were wrapped in plastic bags, while those that were contaminated were either decontaminated or disposed of as waste. In industry, the choice between decontaminating or disposing objects is based on only the economic value of the object and the ease of decontamination. In this case, the IAEA recognized that to reduce the psychological impact of the event, greater effort should have been taken to clean up items of personal value, such as jewelry and photographs. It is not clear from the IAEA report to what degree this was practised.

Means and methods

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After the houses were emptied, vacuum cleaners were used to remove dust, and plumbing was examined for radioactivity. Painted surfaces could be scraped, while floors were treated with acid and Prussian blue mixtures. Roofs were vacuumed and hosed, but two houses had to have their roofs removed. The waste from the cleanup was moved out of the city to a remote place for storage. Aeroradiometric operations were undertaken by low-altitude survey, which was carried out over Goiânia. The radiometric equipment and materials available at the IRD[24] were quickly transported and mounted on a Eurocopter AS350 Écureuil helicopter provided by the police of the state of Goiás.[25]

Potassium alum dissolved in hydrochloric acid was used on clay, concrete, soil, and roofs. Caesium has a high affinity for many clays. Organic solvents, followed by potassium alum dissolved in hydrochloric acid, were used to treat waxed/greased floors and tables. Sodium hydroxide solutions, also followed by dissolved potassium alum, were used to treat synthetic floors, machines and typewriters.

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. Urine from victims was treated with ion-exchange resin to compact the waste for ease of storage.

Recovery considerations

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The cleanup operation was much harder for this event than it could have been because the source was opened and the active material was water-soluble. A sealed source need only be picked up, placed in a lead container, and transported to the radioactive waste storage. In the recovery of lost sources, the IAEA recommends careful planning and using a crane or other device to place shielding (such as a pallet of bricks or a concrete block) near the source to protect recovery workers.

Contamination locations

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Map all coordinates using OpenStreetMap

Download coordinates as:

 
The site of Devair Ferreira's scrapyard in 2020

The Goiânia accident spread significant radioactive contamination throughout the Aeroporto, Central, and Ferroviários districts. Even after the cleanup, 7 TBq of radioactivity remained unaccounted for.

Some of the key contamination sites:

Other contamination was also found in or on:[27]

  • Three buses
  • 42 houses
  • fourteen cars
  • five pigs
  • 50,000 rolls of toilet paper

Legacy

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Disposal of the capsule

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The original teletherapy capsule was seized by the Brazilian military as soon as it was discovered, and since then the empty capsule has been on display at the Escola de Instrução Especializada ("School of Specialized Instruction") in Rio de Janeiro as a memento to those who participated in the cleanup of the contaminated area.[citation needed]

Research

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In 1991, a group of researchers collected blood samples from highly exposed survivors of the incident. Subsequent analysis resulted in the publication of numerous scientific articles.[28][29][30][31]

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A 1990 film, Césio 137 – O Pesadelo de Goiânia (Caesium-137 – The Nightmare of Goiânia), a dramatisation of the incident, was made by Roberto Pires.[32] It won several awards at the 1990 Festival de Brasília.[33] An episode of Star Trek: The Next Generation, "Thine Own Self," was partially inspired by the accident.[34]

Economic implications

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Much of the radioactive substances were cleared after testing. However a gloom hung over the local residents, as they were asked for certificates stating that they were free of radioactivity. Also banned products from Goiânia created a public outcry, citing unjust discrimination.[35]

Foundation

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The state government of Goiás established the Fundação Leide das Neves Ferreira in February 1988, both to study the extent of contamination of the population as a result of the incident and to render aid to those affected.[36]

See also

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References

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  1. ^ a b c d e f g h i j k l m n o p The Radiological accident in Goiânia (PDF). Vienna: International Atomic Energy Agency. 1988. ISBN 92-0-129088-8. Archived (PDF) from the original on March 12, 2016. Retrieved August 22, 2005.
  2. ^ a b c d Foderaro, Lisa (July 8, 2010). "Columbia Scientists Prepare for a Threat: A Dirty Bomb". The New York Times. Archived from the original on September 14, 2017. Retrieved February 24, 2017.
  3. ^ "The Worst Nuclear Disasters – Photo Essays". Time.com. Archived from the original on 3 December 2017. Retrieved 20 October 2018.
  4. ^ Yukiya Amano (March 26, 2012). "Time to better secure radioactive materials". Washington Post. Archived from the original on October 21, 2018. Retrieved August 29, 2017.
  5. ^ Puig, Diva E. "El accidente de Goiania. ¿Por qué hoy?". Apuntes sobre energia nuclear. Lo que los abogados deben saber sobre la tecnología nuclear (in Spanish). Noticias Jurídicas. Archived from the original on May 3, 2014. Retrieved May 2, 2014.
  6. ^ a b c d e Godinho, Iúri (February 8, 2004). "Os médicos e o acidente radioativo" [The doctors and the radioactive accident]. Jornal Opção (in Portuguese). Archived from the original on March 9, 2004.
  7. ^ a b c Borges, Weber (May 27, 2007). "O jornalista que foi vítima do césio". Jornal Opção (in Portuguese).[permanent dead link]
  8. ^ "Planeta Diário". carlalacerda.blogspot.co.uk. Archived from the original on 1 November 2013. Retrieved 20 October 2018.
  9. ^ "Aint No Way to Go: All That Glitters". www.aintnowaytogo.com. Archived from the original on 9 August 2018. Retrieved 20 October 2018.
  10. ^ "Mãe acredita que Leide das Neves é a "santa" criada pela tragédia do césio". Jornal Opção (in Portuguese). September 16, 2017. Retrieved May 9, 2021.
  11. ^ "Brazil Deadly Glitter". Time. October 19, 1987.
  12. ^ Nicholson, Brian (October 18, 1987). "Brazil outraged over atomic accident". United Press International. Retrieved March 18, 2023.
  13. ^ "2 Die of Radiation Poisoning in Brazil". Los Angeles Times. October 24, 1987. Archived from the original on October 16, 2012. Retrieved February 22, 2012.
  14. ^ "País está preparado para atuar em acidente radioativo" [Country is prepared to act in radioactive incident] (in Portuguese). Ministry of Science, Technology and Innovation (MCTI). September 13, 2012. Archived from the original on November 10, 2013. Retrieved November 10, 2013. Note: person named only as "WF" in the IAEA report.
  15. ^ a b "Vida Verde" (in Portuguese). 1987. p. 15. Archived from the original on January 18, 2017. Retrieved February 10, 2016.
  16. ^ "Memorial Césio 137" (in Portuguese). Greenpeace. Archived from the original on January 26, 2008.
  17. ^ Malheiros, Tania (1996). Histórias secretas do Brasil nuclear (in Portuguese). Rio de Janeiro: WVA. p. 122. ISBN 9788585644086. Archived from the original on January 14, 2017. Retrieved February 10, 2016.
  18. ^ Irene, Mirelle (13 September 2012). "Goiânia, 25 anos depois: 'perguntam até se brilhamos', diz vítima". Terra. Archived from the original on 22 February 2014. Retrieved 5 December 2013.
  19. ^ "YouTube". www.youtube.com. Archived from the original on September 1, 2019. Retrieved October 20, 2018.
  20. ^ a b Chmiel, Edward. "Fractionation (radiation therapy)". Radiopaedia.org. Retrieved March 3, 2023.
  21. ^ a b https://nap.nationalacademies.org/resource/11340/beir_vii_final.pdf
  22. ^ UOL. Vítimas do césio 137 voltam a receber remédios e pedem assistência médica para todos Archived 2013-10-29 at the Wayback Machine. September 25, 2012
  23. ^ "Case Law and Administrative Decisions, Judgement of the Federal Court in the Public Civil Action concerning the Goiânia Accident" (PDF). OECD. 2000. Archived from the original (PDF) on March 18, 2012.
  24. ^ Instituto de Radioproteção e Dosimetria - IRD
  25. ^ Conditions and results of the airborne radiometric survey
  26. ^ "IGR – Instituto Goiano de Radiologia". www.igr.com.br. Archived from the original on 3 February 2019. Retrieved 20 October 2018.
  27. ^ Steinhauser, Friedrich (November 2007). "Countering Radiological Terrorism: Consequences of the Radiation Exposure Incident in Goiania (Brazil)". Volume 29 NATO Science for Peace and Security Series: Human and Societal Dynamics: 7. Archived from the original on January 7, 2016. Retrieved January 6, 2016.
  28. ^ Da Cruz, AD; Curry, J; Curado, MP; Glickman, BW (1996). "Monitoring hprt mutant frequency over time in T-lymphocytes of people accidentally exposed to high doses of ionizing radiation". Environmental and Molecular Mutagenesis. 27 (3): 165–75. doi:10.1002/(SICI)1098-2280(1996)27:3<165::AID-EM1>3.0.CO;2-E. PMID 8625952. S2CID 33478289.
  29. ^ Saddi, V; Curry, J; Nohturfft, A; Kusser, W; Glickman, BW (1996). "Increased hprt mutant frequencies in Brazilian children accidentally exposed to ionizing radiation". Environmental and Molecular Mutagenesis. 28 (3): 267–75. doi:10.1002/(SICI)1098-2280(1996)28:3<267::AID-EM11>3.0.CO;2-D. PMID 8908186. S2CID 32582195.
  30. ^ Da Cruz, AD; Volpe, JP; Saddi, V; Curry, J; Curadoc, MP; Glickman, BW (1997). "Radiation risk estimation in human populations: lessons from the radiological accident in Brazil". Mutation Research. 373 (2): 207–14. doi:10.1016/S0027-5107(96)00199-6. PMID 9042402.
  31. ^ Skandalis, A; Da Cruz, AD; Curry, J; Nohturfft, A; Curado, MP; Glickman, BW (1997). "Molecular analysis of T-lymphocyte HPRT– mutations in individuals exposed to ionizing radiation in Goiânia, Brazil". Environmental and Molecular Mutagenesis. 29 (2): 107–16. doi:10.1002/(SICI)1098-2280(1997)29:2<107::AID-EM1>3.0.CO;2-B. PMID 9118962. S2CID 38529905.
  32. ^ "O Pesadelo de Goiânia (1990)". IMDb. August 18, 2013. Retrieved June 9, 2024.
  33. ^ UraniumFilmFestival.org: Roberto Pires Archived 2012-08-13 at the Wayback Machine
  34. ^ "The nuclear accidents we don't hear about – the Goiânia Accident". August 3, 2019.
  35. ^ Simons, Marlise (December 2, 1987). "Radiation Fears Infect Brazil After Accident". The New York Times.
  36. ^ Camargo Da Silva, T. (1997). Leibing, Annette (ed.). Biomedical Discourses and Health Care Experiences: The Goiâna Radiological Disaster. Curare Sonderband. Vol. 12. Berlin: Verlag für Wissenschaft Und Bildung. pp. 72–73. ISBN 9783861355687. Archived from the original on January 18, 2017. Retrieved February 10, 2016.
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