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The radiotherapy accident in Costa Rica occurred with the Alcyon II radiotherapy unit at San Juan de Dios Hospital in San José, Costa Rica. It was related to a cobalt-60 source that was being used for radiotherapy in 1996. An accidental overexposure of radiotherapy patients treated during August and September 1996 was detected. During the calibration process done after the change of 60Co source on 22 August 1996, a mistake was made in calculating the dose rate, leading to severe overexposure of patients. The error of calibration was detected on 27 December 1997. In the course of the accident, 114 patients received an overdose of radiation and 13 died of radiation-related injuries.

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  • 1996 San Juan de Dios radiotherapy accident (en)
  • Siniestro radiológico en Costa Rica (es)
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  • El siniestro radiológico en Costa Rica ocurrió con una unidad de radioterapia Alcyon II, del Hospital San Juan de Dios, de San José, Costa Rica. En el año 1996, se provocó una sobreexposición accidental a los pacientes de radioterapia, durante los meses de agosto y septiembre. Luego del cambio de la fuente de Co-60, el 22 de agosto, y durante el proceso de calibración de la misma, se cometió un error en el cálculo de la tasa de dosis. Debido a esto, se administraron a varios pacientes, dosis de radiación considerablemente mayores a las prescritas (tasas de dosis superiores entre un 50% y 70 % a la prescripción correcta). En el suceso, 115 pacientes se vieron afectados. El error se detectó el 27 de diciembre de 1997.​​ (es)
  • The radiotherapy accident in Costa Rica occurred with the Alcyon II radiotherapy unit at San Juan de Dios Hospital in San José, Costa Rica. It was related to a cobalt-60 source that was being used for radiotherapy in 1996. An accidental overexposure of radiotherapy patients treated during August and September 1996 was detected. During the calibration process done after the change of 60Co source on 22 August 1996, a mistake was made in calculating the dose rate, leading to severe overexposure of patients. The error of calibration was detected on 27 December 1997. In the course of the accident, 114 patients received an overdose of radiation and 13 died of radiation-related injuries. (en)
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  • 9.9325 -84.08472222222223
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  • The radiotherapy accident in Costa Rica occurred with the Alcyon II radiotherapy unit at San Juan de Dios Hospital in San José, Costa Rica. It was related to a cobalt-60 source that was being used for radiotherapy in 1996. An accidental overexposure of radiotherapy patients treated during August and September 1996 was detected. During the calibration process done after the change of 60Co source on 22 August 1996, a mistake was made in calculating the dose rate, leading to severe overexposure of patients. The error of calibration was detected on 27 December 1997. In the course of the accident, 114 patients received an overdose of radiation and 13 died of radiation-related injuries. In 2001, the radiophysicist whose mistake caused the radiation overdoses was charged with 16 culpable homicides and sentenced to six years in prison. (en)
  • El siniestro radiológico en Costa Rica ocurrió con una unidad de radioterapia Alcyon II, del Hospital San Juan de Dios, de San José, Costa Rica. En el año 1996, se provocó una sobreexposición accidental a los pacientes de radioterapia, durante los meses de agosto y septiembre. Luego del cambio de la fuente de Co-60, el 22 de agosto, y durante el proceso de calibración de la misma, se cometió un error en el cálculo de la tasa de dosis. Debido a esto, se administraron a varios pacientes, dosis de radiación considerablemente mayores a las prescritas (tasas de dosis superiores entre un 50% y 70 % a la prescripción correcta). En el suceso, 115 pacientes se vieron afectados. El error se detectó el 27 de diciembre de 1997.​​ (es)
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