primary radiation


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Related to primary radiation: secondary radiation, Scattered radiation

primary radiation

[′prī‚mer·ē ‚rād·ē′ā·shən]
(physics)
Radiation arriving directly from its source without interaction with matter.
References in periodicals archive ?
Of the 3 patients who had been treated with primary radiation alone, only i was alive at 31 years of follow-up.
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.
This point is emphasized by a study performed by Berger et al, in which whole-organ sections were performed on the larynges of patients who presented with presumed T1N0M0 squamous cell carcinoma of the glottis and who failed primary radiation therapy.