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In most cases the class is determined by evaluating the uniqueness of the assignment through chemical separation, reaction type and yield considerations, genetic relationships, arid type of radiation. In a few cases newer techniques have been used. The term "m. s. " in the second column coincid. = measurements with gamma-gammacoincidence counters (for information on decay schemedata not necessarily used in the table); Be-y-e reaction =measurement of neutron energy from Be-y-n reaction;D-y-n reaction = measurement of neutron energy from D-y-n reaction. When internal-conversion electrons are emitted, the energy listed in this column is always that of the corresponding gamma-ray transition. Only the main gamma-rays are listed for the natural radioactive isotopes. In a few instances in which a very short-lived metastable state has been identified as the daughter of the isotope in 0.02V sec.(J11); 12(B4) cl.ch. 0.022 sec.(C2, B22) B-d-P(C2, Fi,BS) N18-n-a(J 2 2 ) C10 C11 20 sec.(S202) 20.5 min. (S8,T8); 20.0 min. (S83& 2(S202) abs. 0.95(D26) cl.ch, ; 0.99 No y(S97) coincid.{S82) spect.

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