Ct Value
Ct Value : Med. A measure of vapor or gas exposure by inhalation. It is a product of the concentration usually expressed in mg/m3 and duration of exposure (t) in minutes. The resulting (and somewhat confusing units) are mg-min/m3. It is important to recognize that this is not simple algebra; predictions of toxic effects should never be extrapolated more than twice, or less than half, known toxic exposure data. (Exposure to 1 mg/m3 for 20 minutes; 2 mg/m3 for 10 minutes; or 4 mg/m3 for 5 minutes are all valid extrapolations of 2-minute exposure data. All three equate to a Ct of 20 mg-min/m3
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