Applied X-ray detection: Which of the following items is particularly amenable to detection by <em>soft</em> X-rays (lower energy, higher absorption by light elements)? Consider penetration and contrast for organic materials. Choose the correct option.

Concept/ApproachSoft X-rays (lower energy) are strongly absorbed by low-Z, organic materials, giving contrast useful for detecting items like narcotics. High-Z materials (lead bullets) require harder X-rays. Coin authentication typically relies on density/composition methods not specific to soft X-rays.

Final AnswerNarcotics