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We measured the yield of 15 O, 11 C and 13 N by photonuclear reactions in water exposed to bremsstrahlung gammas produced with a 1 GeV linac. The activity at saturation reached the values, respectively, of 30, 1.17 and 4.4 × 10 −1 mCi μA −1 cm −3 of water. We describe the measurements and possible implications and we compare the experimental results...