In Roentgen's x-ray experiments, which material served as a fluorescent phosphor on the screen?

In Roentgen's x-ray experiments, which material served as a fluorescent phosphor on the screen?

• A. Calcium tungstate
• B. Cadmium tungstate
• C. Barium platinocyanide
• D. Molybdenum sulfide

Answer: (C)

The key idea is that an X-ray image is formed by turning X-ray energy into visible light so you can see the pattern on a screen. Roentgen achieved this with a fluorescent phosphor that would glow when hit by X-rays. The material he used on the screen was barium platinocyanide because it fluoresced efficiently in response to X-rays, letting him visualize the bones and other structures as shadows. Calcium tungstate and cadmium tungstate are phosphors that were developed later for X-ray screens because they emit bright visible light and improve image quality. Molybdenum sulfide, on the other hand, isn’t used as a fluorescent phosphor for X-ray imaging.

The key idea is that an X-ray image is formed by turning X-ray energy into visible light so you can see the pattern on a screen. Roentgen achieved this with a fluorescent phosphor that would glow when hit by X-rays. The material he used on the screen was barium platinocyanide because it fluoresced efficiently in response to X-rays, letting him visualize the bones and other structures as shadows.

Calcium tungstate and cadmium tungstate are phosphors that were developed later for X-ray screens because they emit bright visible light and improve image quality. Molybdenum sulfide, on the other hand, isn’t used as a fluorescent phosphor for X-ray imaging.