The way exposed X-ray films are processed (and stored) has an important impact on the significance and sustainability of radiographs. Only first-rate darkroom work will ensure radiograph quality to be at a level that justifies the effort made to obtain exposures in comformity with relevant standards.
Since experience in recent years has shown that numerous errors still occur in processing films despite the use of automatic developing machines, the Expert Committee on Radiographic Testing (FA D) of the DGZfP (German Society of Nondestructive Testing) has drawn up a guideline for darkroom work describing the principal and most frequent errors and ways of preventing them when processing films.
This guideline is not intended as a substitute for a textbook or detailed instruction, but is designed to lay sown general rules as a basis for consultation between manufacturers and users on essential questions.

This Guideline applies to all types of welded joints other than fillet welds (see DIN EN ISO 9692:2012 etc.). Follow these instructions as far as possible when dealing with fillet welds, saddle welds, pipe connection welds and overlap slip joint welds.

This guideline provides a practical manual for determing testing zone dimensions in radiographic testing of castings according to DIN EN 12681:2003 for different radiographic setups and varying casting geometries for the case, where radiographic testing cannot be carried out using a central radiographic setup. The aim is to ensure consistent quality of radiographic testing for these cases.