RESUMEN
The German standard series DIN 6868 does not include a separate requirement for deviations in the sensitivity of different emulsion numbers or, respectively, the relative contribution of the film to sensitivity S of a screen film system (SFS) whose sensitivity is determined according to DIN 6867-1 [1]. The inclusion and interpretation of these contributions in the test body exposure according to DIN 6868-3 [2] has not proved to be of value since an unambiguous error recognition is only possible with considerable experimental experience (additional exposure of a sensitometer strip and interpretation of the resulting consequences). The investigations reported here demonstrate that the correlation of sensitometric parameters obtained from sensitometer strips generated with sensiometer exposure and X-ray exposure is so large that differences in sensitivity of different emulsion numbers of a screenfilm larger than delta log H > or = 0.015 or delta H > or = 4% can be surely detected on exact observance of the experimental limiting conditions. Thus, the statements by the manufacturers in "ZVEI information Nr. 7 of the X-ray Regulation" [3] with regard to the claimed scattering width of screenfilms can be tested and evaluated at least tendencially when the systemic fluctuations and measurement uncertainties, see in particular DIN 6868-55 Appendix E of Sept. 1996 (4), are correctly taken into consideration. In general a deviation in the sensitivity exceeding the manufacturers claimed maximal scattering range of delta log H = 0.06, i.e. delta H = 15% can be detected with certainty.