DANB Radiation Health and Safety (RHS) Practice Exam

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Prepare for the DANB Radiation Health and Safety Exam with quizzes including multiple-choice questions, hints, and explanations. Enhance your readiness today!

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What type of current is involved in the cathode-anode circuit in an x-ray machine?

Low voltage
High voltage
AC voltage
DC voltage

The correct answer is: High voltage

In an x-ray machine, the cathode-anode circuit operates using high voltage. The high voltage is essential because it creates the potential difference needed to accelerate electrons from the cathode to the anode. This acceleration is crucial in generating x-rays; when the high-speed electrons collide with the anode target, they lose energy, which is emitted in the form of x-rays. This process requires a significant amount of voltage—typically in the range of 40,000 to 100,000 volts—this high voltage facilitates the efficient generation of x-rays necessary for diagnostic imaging. The presence of high voltage is a defining feature of x-ray tubes, distinguishing them from other types of electrical circuits that might operate under lower voltages. While AC and DC voltage can be used in different applications, the direct current (DC) is often used in modern x-ray machines to provide a consistent flow of electrons, thus leading to a more stable x-ray output. However, the most critical aspect is that the circuit operates under high voltage conditions to ensure effective x-ray production.