ASNT Industrial Radiography Radiation Safety Practice Test

What are the two visible indicators required on X-ray systems to show when X-rays are produced?

1. Milliammeter and a green light

2. Milliammeter and a red light

3. Red light and sound alarm

4. Green light and sound alarm

The correct answer is: Milliammeter and a red light

The correct answer highlights the importance of using visible indicators to ensure safety in environments where X-ray systems are used. In industrial radiography, it is crucial for operators and nearby personnel to be acutely aware of when X-rays are being produced, as they pose significant safety risks. A milliammeter indicates the current of the X-ray tube, effectively demonstrating that the tube is operational and producing X-rays. The inclusion of a red light acts as a clear warning signal; red is universally recognized as an indicator of danger or caution. This combination serves the dual purpose of displaying operational status while also alerting individuals to the potential hazards of exposure to X-ray radiation. Using a green light instead of a red light would not convey the same urgent warning that is necessary in these situations, while also excluding the critical function that the red light serves in making those nearby aware of the radiation risks involved. Additionally, a sound alarm alone would not provide a visual cue, which is also essential for immediate recognition. Therefore, the combination of a milliammeter and a red light effectively communicates the dual message of operation and precaution in an X-ray system.