请问,接触过欧标的朋友G2类胶片是个什么等级?相当于国标的C?急!
原文是这样描述的(仅此):
Practical experience showed that the best possible test result will be achieved by angular radiation (exposure arrangement see figure 1). Testing shall be in accordance with DIN EN 1435, testing category B, i.e. as a rule by X-rays. The use of gamma rays (lr 192) shall be allowed in special cases only.
Vacuum-packed radiographic films of category G2 shall be used with screen combinations adjusted to the respective maximum energy. (A standard concerning the classification of X-ray films is in the course of preparation. Pending its publication, an assignment of film types to film categories authorized by the working group NMP 822 of the Normenausschuss Materialprüfung NMP (Standardization committee material testing) is applicable, published in the DIN-Mitteilungen. Reprints can be obtained from the NMP office).
The radiographic films (length 48 cm) shall be positioned so as to include the butt welds (transverse welds).