Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso


  • Catharine A. Conley
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_464-2


The D-value is a number given to characterize a process to achieve inactivation of 90 % of a population of the test microorganism under stated conditions (temperature, pressure, etc.). This value could be a dose or a concentration for a drug, a time in minute, hour, or day for DHMR, or pasteurization, a dose for sterilization using ionizing radiations (i.e., γ-ray).

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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.NASA HeadquartersWashingtonUSA