World Radiography Day is observed on 8 November since 2007, to mark the date of the discovery of Roentgen's discovery of X-radiation.
In fact, International Radiology Day is also followed by the World Radiography Day.
The European Society of Radiology (ESR) in 2011 resolved that there should be a celebration regarding radiology annually to mark the discovery of X-Radiation done by Roentgen on 8 November, 1895.
Together ESR and the Radiological Society of North America (RSNA) and the American College of Radiology (ACR) decided to observe the International Day of Radiology on 8 November and the first time it was celebrated in 2012.