What can cause static marks on radiographic films?

Static marks on radiographic films are caused by the accumulation of static electricity, which can occur due to various factors. Rapid movement while handling films generates friction, which can produce static charges. When these charged films come into contact with surfaces or even with each other, it can result in the appearance of static marks or “tree” patterns on the resulting images.

Additionally, having wet hands can create a conductive environment that may not completely dissipate static charges. The moisture in wet hands can lead to unintended electrical discharge, thus enhancing the potential for static marks when handling films. Hence, both rapid movement and the state of one's hands can contribute to static marks, which supports the choice indicating both factors as potential causes.

Improper storage methods may lead to issues in film quality over time, but it does not directly cause static marks on the films like the actions mentioned in the other options do.