One characteristic of ionizing radiation on human body is that the energy absorbed is low but the biological effects are serious.For example after receiving a lethal dose of 10 Gy, the body temperature will only increase by 0.02 C but the dose may lead to death of all the exposed entities.he second characteristic is the latent biological effects of radiation. Acute biological effects can occur within several hours to several days while the long term effects usually appear several years after the exposure.