> cannot predict the time, energy, and direction of decay all at the same time The uncertainty principle isn't the aspect of quantum mechanics that is used in

> cannot predict the time, energy, and direction of decay all at the same time The uncertainty principle isn't the aspect of quantum mechanics that is used in these RNGs. They only need the fact that they can perform an action (measurement of some observable) whose outcome is not predictable. They do not attempt to measure different observables, since this would not help produce randomness. It is in essence just a (theoretically ideal) dice roll.