To complete radiographic procedures as a dental assistant in Washington, you must be able to demonstrate their competency upon request to the Washington State Dental Quality Assurance Commission. Dental assistants are still trained in-office to take radiographs because it does take some skill and safety precautions to take them correctly.
Since Radiographs do expose the human body to slight amounts of radiation, typically dental assistants will limit their exposure by setting up the radiograph and activating the sensor a few feet away from the patient. In some dental offices, pregnant dental assistants are not to take radiographs. If you do have concerns about taking radiographs regularly, most dental offices will accommodate you, but there really is not much to worry about with the limited exposure.