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Ionizing radiation such as gamma rays is described as cold sterilization because it

  • A.must be applied to refrigerated material
  • B.requires the load to be frozen first
  • C.sterilizes without an appreciable rise in temperature
  • D.acts only on organisms held at a low temperature

Answer: C

Gamma irradiation penetrates deeply through packaging and needs no heat, which makes it suited to disposable plastic syringes, sutures and catheters that an autoclave would deform. It damages nucleic acid directly and through the radicals it generates in water.

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