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We present ultra-deep Spitzer 70-micron observations of GOODS-North. For thefirst time, the turn-over in the 70-micron Euclidean-normalized differentialsource counts is observed. We derive source counts down to a flux density of1.2mJy. From the measured source counts and fluctuation analysis, we estimate apower-law approximation of the faint 70-micron source counts of dN/dSproportional to S^{-1.6}, consistent with that observed for the faint 24-micronsources. An extrapolation of the 70-micron source counts to zero flux densityimplies a total extragalactic background light (EBL) of 7.4+/-1.9 nW m^{-2}sr^{-1}. The source counts above 1.2mJy account for about 60% of the estimatedEBL. From fluctuation analysis, we derive a photometric confusion level ofsigma_c = 0.30+/-0.15 mJy (q=5) for the Spitzer 70-micron band.Comment: 6 pages including 2 figures and 1 table. Accepted ApJ Letter

S p i t zer 70 Micron Source Counts in GOODS-North