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Compared with ultraviolet light, gamma radiation has

  • A.much less penetrating power
  • B.no effect on bacterial nucleic acid
  • C.an effect confined to spores
  • D.much greater penetrating power

Answer: D

Gamma photons carry far more energy and pass through packaging and dense material, whereas ultraviolet light is absorbed at the surface. That is exactly why gamma is used to sterilize sealed single-use devices and ultraviolet is not.

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