The shadow of the bones in X-ray photographic film appears lighter than the surrounding flesh due to:
Correct answer: C. Bones absorb greater number of X-rays
- A. Bones reflect greater number of X-rays
- B. Bones absorb a lower amount of X-rays
- C. Bones absorb greater number of X-rays
- D. Bones totally reflect X-rays
Explanation
X-rays are a technique used in radiography in which electromagnetic radiation differentially penetrates tissues inside the body and creates images of these structures on photographic film. The greater the density of the material that the X-rays pass through, the more rays are absorbed. Dense bone absorbs much of the radiation, while soft tissue (muscle, fat, and organs) allows more of the X-rays to pass through them. As a result, bones appear white on the X-ray, soft tissue shows up in shades of gray, and air appears black.
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About Biological and Medical Uses of Radiation
Radiation in medicine includes X-rays and gamma rays for imaging, radioactive tracers for diagnosis, and controlled radiation for destroying cancerous tissue. The topic also covers CT scans, PET imaging, radiotherapy, sterilisation, half-life and dosage, alongside biological damage, shielding and the need to balance diagnostic or therapeutic benefit against exposure.
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