An important thing to have in mind when using the TAS technique is that, if nuclei with short half-lifes are measured, the energy spectrum will be contaminated with the gamma cascades of the daughter nuclei produced in the decay chain. Normally the TAS detectors have the possibility to place ancillary detectors inside of them, to measure secondary radiation like X-rays, electrons or positrons. In this way it is possible to tag the other components of the decay during the analysis, allowing to separate the contributions coming from all the different nuclei (isobaric separation).