[en] The decay data (T/sub 1/2/, Q/sub β/, < E/sub β/> and < E/sub γ/>) for fission-product nuclides are reviewed, with emphasis on those nuclides important for decay-heat calculations in the region from ∼10 sec to ∼10³ sec. Problems involved in deducing < E/sub β/> and < E/sub γ/> values for these, and hence for even more neutron-rich, nuclides are illustrated by the example of ⁸⁷Br