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primary radiation

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primary radiation [′prī‚mer·ē ‚rād·ē′ā·shən]

(physics)

Radiation arriving directly from its source without interaction with matter.

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channel electron multiplier
secondary electron

secondary radiation
Thomson scattering

2) The four criteria are (1) a history of primary radiation for a benign process or a malignancy without osteoblastic activity, (2) the presence of a bony sarcoma arising within the path of the radiation beam, (3) a long asymptomatic period, and (4) the presence of histologically proven osteosarcoma.

Radiation-induced osteosarcoma of the maxillary sinus by Osborne, Ryan F. / Ear, Nose and Throat Journal

If the tumor is deemed unresectable or if resection imposes unacceptable morbidity, primary radiation therapy may be considered as a palliative measure.

Perineural invasion of the facial nerve by a cutaneous squamous cell ... by Boey, Howard P. / Ear, Nose and Throat Journal

Although the number of patients we evaluated is too small for meaningful survival analysis, the fact that only 1 of the 5 patients who had stage II disease or less and who had been treated with primary radiation therapy died of their disease within 5 years suggests that irradiation may be a viable treatment option in early-stage disease.

Subglottic carcinoma: Review of a series and characterization of its ... by Hogikyan, Norman D. / Ear, Nose and Throat Journal

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