It is very possible that they all had produced x-rays and didn't know it.
Soon after, others recognized the potential of x-rays in the health care profession. A worldwide revolution in technological advances began. Advancement moved quickly, Lindenthol performed the first contrast-enhanced radiograph of the veins of the hand in January 1896. The first intensifying or magnifying screen was used in March 1896. And in June of 1896 Roentgen's x-ray machine was being used in the battlefield to locate bullets in soldiers.
In the early 1900's two French scientists Marie and Pierre Curie had isolated the element that emits radiation as it decays, radium. Marie won two Nobel Peace Prizes in Physics for her research and the discovery of radium. She also is the person who named radioactivity.
In the early advancements of x-ray, the harmful effects to the exposure of radiation were severe and often fatal to those who pioneered the early research in radiology. As a result of the cancers, maiming and death the use of x-rays came under close scrutiny and control. Methods were developed that would protect the patient and radiographer from radiation exposure.
It soon became apparent that the radiographic techniques needed to be standardized and the radiographers needed training in the proper and safe use of the machine. On May 20,1917 Ed Jerman collaborated with Victor x-ray manufacturing company. Together they formed the first educational department for radiologists. They provided fundamental and technical knowledge to the users of Victor's equipment and to the sales staff. The development of the Coolidge hot cathode tube in 1913 made it possible to duplicate more uniformly. (Making the old gas tubes that were difficult to use, obsolete.) This and other advances at the time helped to standardize the training and define the radiographic qualities.
In October 1920 13 radiographic technicians from nine states and one from a Canadian Province met with Jerman and formed the American Association of Radiological Technicians (AART).