ТЕРМИНЫ
Индикация удлиненная — индикация, длина которой больше, чем ее трехкратная ширина.
Индикация округлая — индикация, длина которой меньше или равна ее трехкратной ширине.

Источник:
"Федеральная служба по экологическому, технологическому и атомному надзору", Москва, НТЦ «Промышленная безопасность»
2005 (ГОСУДАРСТВЕННЫЕ И МЕЖДУНАРОДНЫЕ СТАНДАРТЫ В ОБЛАСТИ
НЕРАЗРУШАЮЩЕГО КОНТРОЛЯ ЧАСТЬ 4 СТАНДАРТЫ ИСО И ЕВРОПЕЙСКИЕ СТАНДАРТЫ НА ВИДЫ И МЕТОДЫ НЕРАЗРУШАЮЩЕГО
КОНТРОЛЯ, КВАЛИФИКАЦИЮ И СЕРТИФИКАЦИЮ ПЕРСОНАЛА, ТРЕБОВАНИЯ К СРЕДСТВАМ КОНТРОЛЯ)

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Note added at 14 час (2013-01-05 13:08:13 GMT)
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Цитата из англоязычногоисточника (Non Destructive Testing in Welder Qualification. Reference: ASME Sec IX)

QW-191 Radiographic Examination
QW-191.1 Method. The radiographic examination in QW-142 for welders and in QW-143 for welding operators
shall meet the requirements of Article 2, Section V, except as follows:
(a) A written radiographic examination procedure is not required. Demonstration of density and penetrameter
image requirements on production or technique radiographs shall be considered satisfactory evidence of compliance
with Article 2 of Section V.
(b) The requirements of T-285 of Article 2 of Section V are to be used only as a guide. Final acceptance of
radiographs shall be based on the ability to see the prescribed penetrameter image and the specified hole or the
designated wire or a wire penetrameter. The acceptance standards of QW-191.2 shall be met.
QW-191.2 Radiographic Acceptance Criteria
QW-191.2.1 Terminology
(a) Linear Indications. Cracks, incomplete fusion, inadequate penetration, and slag are represented on the radiograph as linear indications in which the length is more than three times the width.
(b) Rounded Indications. Porosity and inclusions such as slag or tungsten are represented on the radiograph
as rounded indications with a length three times the width or less. These indications may be circular, elliptical, or
irregular in shape; may have tails; and may vary in density.