Decay data for decay heat predictions

The main source of data for the decay heat prediction is now coming from ENSDF. The total decay energy, the half lives, the beta and gamma branching and the average values are generally present in ENSDF, when they have been measured. But the main objective of ENSDF is to describe the nuclear structure properties. The average values are sometimes missing and never estimated. We'll review, all we can find in ENSDF as data for decay heat predictions. Their systematic analysis can be a solution to estimate average energies, when no measurement is available. Average energies are also measured using a spectrometer. A comparison between data in ENSDF and results from direct measurement will be done. Theoretical models can also predict the decay data properties