It is far safer to sleep beside a cellsite than it is to work with ionizing radiation.

Electromagnetic energy is carried by photons. The higher the frequency, the higher the energy in each photon. When a certain energy level is reached, the photon has enough energy to knock off electrons from molecules that it encounters. At this point it is called ionizing radiation. The critical energy level is 10 electron volts (eV). One Joule is 6.2x10E18 electron volts, so a single electron volt is immeasurably small. Here's how to calculate the energy of a photon, depending on its frequency:

E=h
h=Planck's constant = 6.626E-34 Joule-seconds

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