Roth J
Rontgenblatter. 1977 Oct;30(10):531-3.
Variability of blackening of X ray films may be due to inconstant concentration or temperature of the developer. Reproducibility was examined with stepwise blackening, exposed under standard conditions and densitometrically evaluated after development. The resulting differences of blackening are without significance for the subjective assessment of X ray films, since they lie within +/- 10%.
X射线胶片黑化的可变性可能是由于显影剂浓度或温度不稳定所致。通过逐步黑化来检验再现性，在标准条件下曝光，并在显影后进行密度测定评估。黑化产生的差异对于X射线胶片的主观评估没有意义，因为它们在±10%范围内。
