For detection systems that record discrete events, such as particle and nuclear detectors, the dead time is the time after each event during which the system is not able to record another event. Is that something you need to know about an audio plugin? No. But it makes decent copy.
If you would like to try it out before you buy, you can download the installer here. After installation, open Dead Time in your DAW of choice, and you can initiate a free 3-day trial.