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 B. 45 degrees.
When performing a mobile unit radiographic examination, the radiographer should stand at a 45-degree angle to the primary x-ray beam. This positioning reduces the radiographer’s exposure to the direct path of the x-ray beam, which is the most dangerous. The 45-degree angle minimizes the risk of radiation exposure while maintaining an effective level of monitoring and positioning.
Radiation is emitted in all directions, and standing directly in line with the x-ray beam increases the risk of overexposure. X-ray scatter, which occurs when the beam hits an object and changes direction, is another factor that increases exposure. By positioning at a 45-degree angle, the radiographer is not only avoiding the direct line of the primary beam but also reduces exposure to scattered radiation. Scattered radiation is much less intense than the primary beam but still poses a health risk.
In addition, when working with a mobile x-ray unit, the radiographer should be mindful of the distance from the patient and the x-ray machine. The further away from the radiation source, the lower the potential exposure. The radiographer should also wear protective gear such as lead aprons and thyroid shields to further minimize any risk of radiation exposure.
Moreover, maintaining a safe distance from the patient and the x-ray beam, as well as staying at a 45-degree angle, is a key part of the radiation safety principles: time, distance, and shielding. Keeping these factors in mind allows for safer working practices during mobile radiographic procedures.