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. . . . . . . . . . S. dx. F. Ds. Suppose there is a target of area Ds in a volume dx X S. An incident flux, F, of projectiles strikes the volume.. The density of targets of area DsIs r.. . . The quantity l = Dsr, is called the absorption coefficient. Usually the total cross section is understood to be used in this expression and it is simply written as s. Target thickness are often quoted in grams/cm2. This is because the important quantity for rate calculation is rx. What we really use in r20

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