For example, for decays of Cs, 98.1% are ε (electron capture) or β (positron) decays, and 1.9% are β (electron) decays. The partial decay constants can be calculated from the branching fraction and the half-life of Cs (6.479 d), they are: 0.10 d (ε + β) and 0.0020 d (β). The partial half-lives are 6.60 d (ε + β) and 341 d (β). Here the problem with the term partial half-life is evident: after (341+6.60) days almost all the nuclei will have decayed, not only half as one may initially think.