What does the term SCREEN LAG refer to in radiography?

In radiography, SCREEN LAG specifically refers to the phenomenon of phosphorescence or afterglow. This occurs when a radiographic screen continues to emit light for a brief period after the radiation exposure has ceased. This afterglow can lead to unwanted effects on the resulting image, such as blurring or streaking, as the screen may still be emitting light while the film is being developed. Understanding screen lag is crucial for ensuring that radiographic images are clear and accurately represent the object being examined, as any lingering light can introduce artifacts that compromise image quality. Recognizing the implications of screen lag helps radiographers select the appropriate screens and exposure times to minimize these effects and maintain high standards of radiographic practice.