Radiation is emitted from the front of a tablet, but dangers are negligible at a distance of one foot our more.
Screen and side emissions tend to be much less and the top tends to be the same as the bottom, but less harmful. Less harmful because you are not in direct contact with the emissions for long periods of time. These radiation levels are also considered acceptable, low-rise emissions. As a rule of thumb, just being one foot away from the source of the emissions, the dangers are negligible.
In summary, the most harmful emissions are in the downward direction and the DefenderShield® is designed to shield that direction. Emissions should always be shielded if they are touching the human body.