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Related to primary radiation: secondary radiation, Scattered radiation

PRIMARY. That which is first or principal; as primary evidence, or that evidence which is to be admitted in the first instance, as distinguished from secondary evidence, which is allowed only when primary evidence cannot be had.
     2. A primary obligation is one which is the principal object of the contract; for example, the primary obligation of the seller is to deliver the thing sold, and to transfer the title to it. It is distinguished from the accessory or secondary obligation to pay damages for not doing so. 1 Bouv. Inst. n. 702.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Primary radiation therapy can begin when the incision site has healed, typically 2 weeks to 5 weeks after lumpectomy and axillary dissection.
The 3-year locoregional recurrence rates according to the type of treatment were 18% for surgery plus radiation therapy (2 of 11 patients), 67% for primary radiation only (2 of 3), and 25% for surgery only (2 of 8).
In view of the excellent outcomes, localized primary radiation therapy has become the treatment of choice for extramedullary plasmacytoma.
After a complete workup and discussion, the patient elected to undergo primary radiation treatment.
(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.
If the tumor is deemed unresectable or if resection imposes unacceptable morbidity, primary radiation therapy may be considered as a palliative measure.