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The health hazard from radon is caused chiefly by

  • A.Chemical toxicity of the gas
  • B.Gamma radiation from the gas
  • C.Its short-lived decay products depositing in the lung
  • D.The radon gas dissolving in the blood

Answer: C

Radon itself is inert and largely exhaled again, but its solid decay products attach to airborne particles, lodge in the bronchial epithelium and irradiate it with alpha particles. That is why the working level, not the radon concentration alone, describes the dose.

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