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5. Radioprotectors 1) reduces the heating of tissue when it is irradiated with waves of the radio frequency range; 2) increases the heating of tissue when it is irradiated with waves of the radio frequency range; 3) increases the radiobiological effect when the tissue is irradiated with ionizing radiation; 4) reduces the radiobiological effect when the tissue is irradiated with ionizing radiation; 5) contributes to increase the contrast of X-ray images.3. The penetration depth of electromagnetic radiation into biological tissue is the distance at which '1} incident energy power increases by a factor of e; 2) radiation wavelength increases by a factor of e; 3} incident energy power decreases by a factor ofe; 4) radiation wavelength decreases by a factor of e; 5} radiation wavelength decreases by a factor of ill