None observed so far. Anyway: there is no such thing as 5G radiation. 5G is a communication standard - i.e. a set of protocols that regulate how systems communicate “over the air” interpret the transmitted or received electromagnetic waves.
Which means: “5G radiation” is run-of-the-mill electromagnetic radiation. Different flavors of lectromagnetic radiation are distinguished by wavelength resp. frequency (which amounts to the same, since the product of wavelength and frequency is the speed of light). Only special chunks of spectrum (the whole continuousset of possible electromagnetic waves) allow to use it for communication purposes, and most of them are used for other purposes already, so that they cannot be allocated.
Generally we talk about the spectrum from 50 kHz to 50 MHz as AM waves, and they have been used by long and short radio waves (the ones you receive by your radio receiver). Up to 500 MHz I would talk about Ultrashort waves; they are used by FM radio stations and terrestrial TV. So these waves are around since almost forever; they are transmitted day in day out. The transmission power goes up to more than 100 kW (100,000 Watt — we need that number later on) for AM transmitters and between 1 Watt and 100 Watts for FM.
Between 450 MHz and 5 GHz is the traditional turf for mobile radio (2G, 3G, 4G, 5G, and all smartphones and traditional cellphones). Technicians call this area of electromagnetic spectrum Microwave. 2G has started with 900 MHz, and added 1800 and 1900 MHz early in the 1990s. 3G had roughly 2000 MHz, 4G ranged from 450 MHz (just recently permitted) up to 2600 MHz. 5G will use the same spectrum as 4G, fill some gaps that have not been used at present, take over some of the 4G spectrum, and add something in the 3500 MHz. Area. On top there is the so-called New Radio above 28 000 MHz. Transmission energies are at 20 (max 40 ) Watts per antenna. Compare that with the data for AM and FM radio.
Other radiation in this area are for example your WLAN (2 400 and 5000 MHz), or your cordless phone (which is in the 2000 MHz domain).
Also 2G is around since early 1990s, and still going. No effects have been observed.
How could electromagnetic waves affect living tissue anyway? We separate the spectrum into two areas:
low frequency , which is up to around the frequency of visible light
High frequency, which is above the visible light frequencies and includes Ultraviolet, X-ray and Gamma rays. They are well known for their potential of causing cancer in human and animal cells. The reason is that the total energy of electromagnetic radiation is a product of two factors: the frequency (which translates into the energy of a single photon, of which the radiation is composed if you apply quantum theory) and the amplitude (which is the number of such photons per area unit of the receiver). It is only the frequency, i.e. the photon energy which decides if a malicious effect on tissue can be expected at all — after all it is always a single photon (or a couple of them) which interact with the tissue cell locally. You dont get a “sunburn” from radio waves.
So which effect can low frequency electromagnetic radiation have to the body? The single photon energy is too low to have an impact on molecules or atoms directly; there is simply no match between its energy and the energy needed to ionize an atom or break a bond, which are the two conceivable ways to affect a bio-chemical structure. The low frequency electromagnetic waves can still interact with water in the tissue. Not by breaking any bonds, but by speeding up water molecule rotation and movement. This effect is felt as heat by living creatures. You can see the effect in the microwave oven. It works in the same frequency domain as the 2G/3G/4G/5G radiation, but with much higher energy (500 Watts to more than 1 KiloWatt, applied to the tissue from a short distance of 20 cm). Mobile towers apply about 5% of that energy at minimum 100 m — and the energy decreases by the square of the distance.
Mobile phones have a much higher impact to your body than the towers. You can avoid this altogether by not using a mobile phone. But then I would also strictly recommend to not use a cordless, and return to good old cabled Ethernet for your home network. These are much stronger radiators than a mobile phone, which is restricted to max 200 mW.
