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Low-temperature nuclear orientation experiments on radioactive 56 Mn ions implanted into insulating, antiferromagnetic crystals of MnCl 2 •4H 2 O and CoCl 2 •6H 2 O are reported. In MnCl 2 •4H 2 O, comparison of the ␥-ray anisotropy of the 56 Mn nuclei with that of 54 Mn, doped into the sample during growth, showed that both the 56 Mn and 54 Mn spins felt a very similar hyperfine field. The site occupancy factor in a simple, two-site model was deduced to be 0.96 Ϫ0.07 ϩ0.04 . In CoCl 2 •6H 2 O, the average hyperfine field for the implanted 56 Mn was significantly less than that for 54 Mn and corresponded to f ϭ0.53Ϯ0.10.

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