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(1980). Procedures in External Radiation Therapy Dosimetry with Electron and Photon Beams with Maximum Energies Between 1 and 50 MeV Recommendations by the Nordic Association of Clinical Physics (NACP) Acta Radiologica: Oncology: Vol. 19, No. 1, pp. 55-79.
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A 1980 study studied this question.
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