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This article lists notable civilian accidents involving radioactive material. Military accidents are listed at List of military nuclear accidents.

Scope of this article

In listing civilian radiation accidents, the following criteria have been followed:

1. There must be well-attested and substantial health damage, property damage or contamination.
2. The damage must be related directly to radioactive material, not merely (for example) at a nuclear power plant.
3. To qualify as "civilian", the operation/material must be principally for non-military purposes.
4. The event is not an event involving fission, fissile matter or a reactor.

Please also see List of civilian nuclear accidents

Before 1950s

• Luminescent radium was used to paint watches and other items that glowed, but the dangers were largely unknown. The most famous incident is the Radium girls of Orange, New Jersey, but other towns including Ottawa, Illinois experienced contamination of homes and other structures.
• Radium mining and manufacturing left a number of Denver, Colorado streets contaminated.

1950s

• March, 1957– Employees of a Houston company licensed by the Atomic Energy Commission to encapsulate sources for radiographic cameras were exposed to iridium-192 powder (resulting in radiation burns to the two workers directly exposed). The powder was then spread to several homes and cars in the community. The incident was reported in Look Magazine in 1961; investigations published by the Mayo Clinic that same year found few of the radiological injuries claimed in widespread press reports, but failed to assuage public fears that followed publicity of the accident.
• September, 1957– Kyshtym accident near Chelyabinsk-40, USSR: about 7.4xl0 Bq of radioactive products were ejected forming a kilometer-high radioactive cloud that left a radioactive trace of 15,000 sq.km., as a result of the explosion of a waste tank.

1960s

• 1961 During a routine maintenance procedure at the Idaho National Laboratory, ID, a technician manually pulled on a stuck reactor control rod, resulting in exceeding the safe distance of removal. The resulting core meltdown and explosion resulted in the deaths of the technician and two other workers at the plant. First responders measured radiation dosages in hundreds of rads. The bodies were buried in lead caskets.
• 21 April 1964, the U.S. Transit-5BN-3 navigation satellite failed to achieve orbit after launch and burnt up on re-entry north of Madagascar. The 17,000 Ci of plutonium 238 metal fuel was injected into the atmosphere where it burnt up, and traces of plutonium 238 were detected in the area a few months later.
• 21 January 1969 In Lucens, Switzerland, a pilot power reactor suffers a loss of coolant accident and partial core meltdown. Almost all of the radiation is contained inside the cavern containing the reactor. INES Level 4 Accident.

1970s

• July 16, 1979 (34th anniversary of the Trinity test) – In Church Rock, New Mexico, the earth/clay dike of a uranium mill's settling/evaporating pond fails. The pond was past its planned and licensed life and had been filled two feet (60 cm) deeper than design, despite evident cracking. The incident drains about 100 million US gallons (380,000 m³) of radioactive liquids and 1100 short tons (1000 metric tons) of solid wastes, which settle out up to 70 miles (100 km) down the Rio Puerco
• September 29, 1979 - Tritium leak at American Atomics in Tucson, Arizona; at the public school across the street from the plant $300,000 of food is found contaminated; chocolate cake had 56 nCi/L; by contrast, the EPA safety limit for drinking water is 20 nCi/L (740 Bq/L) based on consumption of 2 liters per day.

1980s

• February 11, 1981 – A new worker inadvertently opened a valve and more than 100,000 US gallons (380 m³) of slightly radioactive water leaked into the containment building of the Tennessee Valley Authority Sequoyah 1 nuclear power plant in rural Tennessee. Fourteen workers came into contact with the water.
• March 1981 – More than 100 workers were exposed to doses of up to 155 millirem per day radiation during repairs of a nuclear power plant in Tsuruga, Japan, violating the company's limit of 100 millirems (1 mSv) per day.
• July 1981 – Lycoming, Nine Mile Point, New York. An overloaded waste water tank was deliberately flushed into the waste building sub-basement, filling it to a depth of four feet. This caused some of the approximately one hundred fifty 55 U.S. gallon drums that were stored there to overturn and spill their contents. Fifty thousand U.S. gallons (190 m³) of lesser-contaminated water was discharged into Lake Ontario. October 2 1989
• 1982 – International Nutronics of Dover, New Jersey spilled an unknown quantity of radioactive cobalt solution used to treat gems for color, modify chemicals, and sterilize food and medical supplies. The solution spilled into the Dover sewer system and forced the closure of the plant. The Nuclear Regulatory Commission was only informed of the accident ten months later by a whistleblower. In 1986 International Nutronics was fined $35,000 and one of its top executives was sentenced to probation for failure to report the spill.
• December 6, 1983 – Juarez Mexico, A local resident salvaged materials from a discarded radiation therapy machine carrying 6000 pellets of cobalt-60. The dismantling and transport of the material led to severe contamination of his truck; when the truck was scrapped, it in turn contaminated another 5000 metric tons of steel with an estimated 300 curies (11 terabecquerels) of activity. This material was sold for kitchen table legs and building materials some of which was sent to the U.S. and Canada; the incident was discovered when a truck delivering contaminated building materials months later to the Los Alamos National Laboratory accidentally drove through a radiation monitoring station. Contamination was later measured on the roads that were used to transport the original damaged radiation source. In some cases pellets were actually found embedded in the roadway. In the state of Sinaloa, 109 houses were condemned due to contaminated building material. This incident prompted the NRC and US Customs Service to install radiation detection equipment at all major border crossings. [http://www.nuclearfiles.org/hitimeline/nwa/80/1984.html
• 1985 to 1987, Therac-25 was a radiation therapy machine produced by Atomic Energy of Canada Limited. It was involved with at least six known accidents between 1985 and 1987, in which patients were given massive overdoses of radiation, which were in some cases on the order of hundreds of grays. At least five patients died of the overdoses. These accidents highlighted the dangers of software control of safety-critical systems.
• January 6, 1986 – At the Kerr-McGee nuclear fuel reprocessing plant in Gore, Oklahoma, a cylinder of uranium hexafluoride burst after being improperly heated. One worker died of caustic chemical exposure, 30 were injured.
• 1986 – The NRC revoked the license of a Radiation Technology, Inc. (RTI) plant in New Jersey for worker safety violations. A safety device to prevent people from entering the irradiation chamber during operation had been bypassed. A worker had received a near-lethal dose of radiation. RTI was cited 32 times. Violations also included throwing radioactive garbage out with the regular trash.
• January 1987 – A Columbia University undergraduate steals radioactive uranium-238 (from a cyclotron Fermi had used in his early fission experiments) and hides it in his roommate's alarm clock. A USNRC investigation found no significant harm to person or property, though the student was expelled.
• September 13, 1987 – In the Goiânia accident, scavengers broke open a radiation-therapy machine in an abandoned clinic of Goiânia, Brazil. They sold the kilocurie (40 TBq) caesium-137 source as a glowing curiosity. Four hundred were contaminated, four die.
• June 6, 1988 – Radiation Sterilizers in Decatur, Georgia, reported a leak of caesium-137 at their facility. Seventy thousand medical supply containers and milk cartons were recalled. Ten employees were exposed, and three "had enough on them that they contaminated other surfaces", including their homes and cars.
• 5 February, 1989 Three workers were exposed to gamma rays from the source in a medical products irradiation plant in San Salvador, El Salvador. The most exposed person died while the other two lost limbs. This was a human error accident where a person made the wrong choice to enter the irradiation room.

1990s

• June 24, 1990 – Soreq, Israel An operator at a commercial irradiation facility bypassed the safety systems on the JS6500 sterilizer to clear a jam in the product conveyor area. The one to two minute exposure resulted in a whole body dose estimated at 10 Gy or more. He died 36 days later despite extensive medical care. See Fool Irradation for a discussion of this type of event.
• October 26 1991 – Nesvizh, Belarus An operator at an atomic sterilization facility bypassed the safety systems to clear a jammed conveyor. Upon entering the irradiation chamber he was exposed to an estimated whole body dose of 11 Gy, with some portions of the body receiving upwards of 20 Gy. Prompt intensive medical care managed to keep him alive for 113 days after the accident.
• April 6, 1993 – Tomsk, Russia At the Tomsk-7 Siberian Chemical Enterprise plutonium reprocessing facility, a pressure buildup led to an explosive mechanical failure in a 34 cubic meter stainless steel reaction vessel buried in a concrete bunker under building 201 of the radiochemical works. The vessel contained a mixture of concentrated nitric acid, uranium (8757 kg), plutonium (449 g) along with a mixture of radioactive and organic waste from a prior extraction cycle. The explosion dislodged the concrete lid of the bunker and blew a large hole in the roof of the building, releasing approximately 6 GBq of Pu 239 and 30 TBq of various other radionuclides into the environment. The accident exposed 160 on-site workers and almost two thousand cleanup workers to total doses of up to 50 mSv (the threshold limit for radiation workers is 100 mSv per 5 years). The contamination plume extended 28 km NE of building 201, 20 km beyond the facility property. The small village of Georgievka (pop. 200) was at the end of the fallout plume, but no fatalities, illnesses or injuries were reported.
• August 31, 1994 – Commerce Township, Michigan David Hahn's experimental reactor was discovered in his mother's back yard. The unshielded reactor exposed his neighborhood to 1000 times the normal levels of background radiation.
• October 21, 1994 a large Cs-137 source is stolen by scrap metal scavengers in Tammiku (Estonia).
• November 16, 1996, The Russian Mars 96 probe fails to achieve orbit following launch and burns up over South America. The two RTGs onboard carrying a total of 200 g of plutonium-238 are designed to survive re-entry and are assumed to now lie somewhere in the Atacama Desert.
• May 1998 – Recycler Acerinox in Cádiz, Spain, unwittingly melts scrap metal containing radioactive sources; the radioactive cloud drifts all the way to Switzerland before being detected.
• 1999 – A road near Mrima Hill, Kenya was rebuilt using local materials later found to be radioactive. Some workers were exposed to excessive radiation, and many residents of the area were tested for exposure. 2,975 tons of roadway material were to be dug up to eliminate the hazard.

2000s

• February 9, 2002 – Two workers were exposed to a small amount of radiation and suffered minor burns when a fire broke out at the Onagawa Nuclear Power Station Miyagi Prefecture. The fire occurred in the basement of reactor #3 during a routine inspection when a spray can was punctured accidentally, igniting a sheet of plastic.
• March 11, 2002 – A 2.5 tonne Cobalt-60 gamma source was transported from Cookridge Hospital, Leeds, UK, to Sellafield with defective shielding. As the radiation escaped from the package downwards into the ground, it is not thought that this event caused any injury or disease in either a human or an animal. This event was treated in a serious manner because the defense in depth type of protection for the source had been eroded. If the container had been tipped over in a road crash then a strong beam of gamma rays would have been directed in a direction where it would be likely to irradate humans. The company responsible for the transport of the source, AEA Technology plc, was fined £250,000 by a British court.
• 2003 – Cape of Navarin, Chukotka Autonomous Okrug, Russia. A radioisotope thermoelectric generator (RTG) located on the Arctic shore was discovered in a highly degraded state. The level of the exposition dose at the generator surface was as high as 15 R/h; in July 2004 a second inspection of the same RTG showed that gamma radiation emission had risen to 87 R/h and that strontium-90 had begun to leak into the environment. In November 2003, a completely dismantled RTG located on the Island of Yuzhny Goryachinsky in the Kola Bay was found. The generator's radioactive heat source was found on the ground near the shoreline in the northern part of the island.
• September 10 2004 – Yakutia, Russia. Two radioisotope thermoelectric generators — were dropped 50 meters onto the tundra at Zemlya Bunge island during an airlift when the helicopter flew into heavy weather. According to the nuclear regulators, the impact compromised the RTGs' external radiation shielding. At a height of 10 meters above the impact site, the intensity of gamma radiation was measured at 4 millisieverts per hour.
• 2005 – Dounreay, UK. In September, the site's cementation plant was closed when 266 litres of radioactive reprocessing residues were spilled inside containment. . In October, another of the site's reprocessing laboratories was closed down after nose-blow tests of eight workers tested positive for trace radioactivity.
• November 3, 2005 – Haddam, Connecticut, USA. The Connecticut Yankee Atomic Power Company reports that water containing quantities (below safe drinking water limits) of Cs-137, Co-60, Sr-90, and tritium leaked from a spent fuel pond. Independent measurements and review of the incident by the US Nuclear Regulatory Commission are due to begin November 7, 2005.
• March 11, 2006 – at Fleurus, Belgium, an operator working for the company Sterigenics, at medical equipment sterilization site, entered the irradation room and remained there for 20 seconds. The room contained a source of Co-60 which was not in the pool of water. Three weeks later the worker suffered of symptoms typical of an irradiation (vomit, loss of hair, fatigue). One estimate that he was exposed to a dose of between 4.4 and 4.8 Gy due to a malfunction of the control-command hydraulic system maintaining the radioactive source in the pool. The operator spent over one month in a specialized hospital before going back home. Today he still shows after-effects (fatigue) that should attenuate in several months. To protect workers, the federal nuclear control agency AFCN and private auditors from AVN recommended Sterigenics to install a redundant system of security. It is an accident of level 4 on the INES scale.
• March 16, 2006 – The State of Illinois sued Exelon Corporation for repeated leaks of tritium into water discharged around its Braidwood Nuclear Generating Station. Exelon states that despite the leaks it has operated within legal limits, but agreed to compensate landowners. The tritium was produced during normal operation and, as fuel reactivity declines, is legally discharged with the borated water into the nearby river. However, some of this water leaked onto land. On March 20, the Nuclear Regulatory Commission announced it had formed a task force to examine tritium leaks , and a "white paper" was issued on June 30.
• May 5, 2006 – An accidental release of radioactive iodine gas at a nuclear power plant in Minnesota exposed approximately one hundred plant workers to low-level radiation. Most workers received 10 to 20 millirems (0.1-0.2 mSv), about the same as a dental x-ray. The workers were wearing protective gear at the time, and no radiation leaked outside the plant to the surrounding area.

See also

• International Nuclear Events Scale
• List of disasters
• List of nuclear reactors - a comprehensive annotated list of the world's nuclear reactors
• Radiation
• Nuclear Power
• Nuclear Reactor

References and external links

• Schema-root.org: Nuclear Power Accidents 2 topics, both with a current news feed
• US Nuclear Regulatory Commission (NRC) website with search function and electronic public reading room
• International Atomic Energy Agency website with extensive online library
• Canada's Nuclear Safety Commission (CNSC)
• Concerned Citizens for Nuclear Safety Detailed articles on nuclear watchdog activities in the US
• World Nuclear Association: Radiation Doses Background on ionizing radiation and doses
• Canadian Centre for Occupational Health & Safety More information on radiation units and doses.
• Radiological Incidents Database Extensive, well-referenced list of radiological incidents.

1. Ken Hechtman,

• Nuclear accidents
• Nuclear safety
• Radioactivity