By International Atomic Energy Agency
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Extra info for Accidental Overexposure of Radiotherapy Patients in San Jose, Costa Rica
This room is occupied by patients staying for extended periods of time, visitors and the attendant hospital staff. The shielding is not acceptable. In particular, the ceiling of this room was not designed for radiotherapy (see Fig. 1 of Appendix I). Since the shielding cannot be increased, one solution that merits a feasibility study would be to exchange use of this room with use of the shielded room for the Theratron-80, since the latter has a beam stopper with an attenuation factor of about 1000.
RADIATION SHIELDING Dose rate measurements were made in different locations outside the irradiation room. From the results obtained, and assuming a normal workload for this room of about 500 Gy/week and a use factor of 30% with the unattenuated beam directed towards the ceiling, the radiation levels in the room above would be 1 Sv/a. This room is occupied by patients staying for extended periods of time, visitors and the attendant hospital staff. The shielding is not acceptable. In particular, the ceiling of this room was not designed for radiotherapy (see Fig.
The patient had occasional diarrhoea. Patient No. 5 Gy each). This treatment is calculated to be biologically equivalent to about 31 fractions of 2 Gy each, with a total dose to the bowel of about 62 Gy. 5. CARDIOVASCULAR SYSTEM Radiation induced changes in the heart have been reported in patients treated for Hodgkin’s disease. Cardiomyopathy rarely occurs with standard fractionation schemes and doses of less than 40 Gy. Above this level, up to half of the patients will experience pericarditis.