Accidental Overexposure of Radiotherapy Patients in San by International Atomic Energy Agency

By International Atomic Energy Agency

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The number of fractions following the source change was counted from Monday, 26 August 1996. For those charts where a Theratron treatment time had been entered on the front page in addition to the Alcyon treatment time it was assumed that the Alcyon had been used for all the treatments, since there was no record of when the Theratron had been used. In addition, prior compilation of the doses after the source change, made by H. Marenco Zúñiga, was also used to obtain other parameters. The total tumour dose was reconstructed by adding the prescribed dose multiplied by the number of fractions administered before the source change to the estimated dose administered after the source change.

26 After an exchange of several letters with the Costa Rican authorities, an Expert Team was convened by the IAEA in San José to assess the accident between 7 and 11 July 1997. The Expert Team finalized its work at a meeting held at the IAEA Headquarters from 1 to 6 September 1997. 2. , Jr. , Institut de protection et de sûreté nucléaire, Fontenay-aux-Roses, France; Ortiz López, P. , Universidad de Costa Rica, Defensoría de los Habitantes, Servicio de Oncología, Hospital México, San José, Costa Rica.

Reference [18] 45 has published information on the tolerance curves for 25–50% incidence of thoracic myelopathy. 3 Gy per fraction), including Patient No. 97. From the above data it can be seen that this patient is well over the total dose tolerance level for the spinal cord (about 30–35 Gy for this fraction size). Patient No. 1 Gy per fraction). The total tolerance dose for this fraction size is 40 Gy. These two patients are paralysed. Other patients examined by the Expert Team are not paralysed, but are nonetheless at major risk.

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