D-value (microbiology)
（重定向自Decimal reduction time）
In microbiology, D-value refers to decimal reduction time (or decimal reduction dose) and is the time (or dose) required at a given condition (e.g. temperature), or set of conditions, to kill 90% (or 1 log) of the exposed microorganisms. The term originated from assessing microbial thermal resistance and thermal death time analysis; however, it has analogous uses in other microbial resistance and death rate applications, such as (but not limited to) those of ethylene oxide and radiation processing.