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The D-value of a sterilization process is the

  • A.temperature at which all organisms are killed instantly
  • B.total time a load must remain in the chamber
  • C.smallest concentration that prevents any growth
  • D.time or dose needed to inactivate 90% of the test population

Answer: D

The D-value expresses killing as a rate: each D-value reduces the survivors tenfold, so inactivation is logarithmic rather than sudden. That is why sterility is specified as a probability of a survivor rather than as an absolute certainty.

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