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单词 eve's constant
释义 eve's constant
\ˈēvz-\ noun
Usage: usually capitalized E
Etymology: after Arthur S. Eve died 1948 British physicist
: a measure of the intensity of radioactivity of a given substance consisting of the number of ions produced per second per cubic centimeter of ordinary air at a distance of one centimeter from one gram of the substance when in radioactive equilibrium
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