When performing a mobile unit radiographic examination, the radiographer should stand at what angle to the beam?
A. 30 degree B. 45 degree C. 75 degree D. 90 degree
The correct answer and explanation is:
The correct answer is C. 75 degree.
When performing a mobile radiographic examination, the radiographer should stand at an angle of 75 degrees to the primary x-ray beam. This positioning is crucial for minimizing radiation exposure to the radiographer while ensuring that the image quality is not compromised. The x-ray beam typically spreads out in a cone shape, and the intensity of radiation decreases as the distance from the beam increases. Therefore, standing at an angle rather than directly in line with the beam reduces the amount of scattered radiation that the radiographer is exposed to.
The 75-degree angle is optimal for mobile radiography because it provides a good balance between minimizing radiation exposure and maintaining a clear, high-quality image. In practice, the radiographer should also be mindful of their distance from the patient and the beam. Standing farther from the source of radiation further reduces exposure, and using protective shields such as lead aprons or thyroid collars is highly recommended.
Furthermore, the concept of “ALARA” (As Low As Reasonably Achievable) is always emphasized in radiology practice. By maintaining a 75-degree angle, the radiographer minimizes their exposure while still maintaining their ability to operate the equipment effectively. It is also important to remember that the distance from the radiation source, the use of shielding, and the duration of exposure all contribute to the radiographer’s overall safety during a mobile examination.
Mobile radiography, which is typically done in patient rooms, emergency departments, or operating rooms, requires extra caution because of the restricted space and the close proximity to the patient. By following proper safety protocols, the radiographer can significantly reduce their exposure to ionizing radiation.