Relativistic effects can explain the energy shift of - 6 keV reported by Ramayya et al. for the gamma-ray de-exciting the first 2 (+) state, at 3368.03 keV, of the Be-10 cluster emitted together with the fragments Ba-146 and Sr-96 in the ternary fission of Cf-252; the calculated shift is equal to -6.14 (0.16) keV. An explanation is presented for the apparent absence of Doppler broadening. For the configurations Xe-138-Zr-104-Be-10 and Te-136-Mo-106-Be-10, recently reported by Hamilton et al. , observable shifts of the 3367.43 keV gamma-line are predicted.
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