The linear no-threshold model (LNT) is a risk assessment approach used to estimate the potential biological effects of ionizing radiation on human health, suggesting that there is no safe level of exposure and that even the smallest dose can increase the risk of cancer. This model posits a direct relationship between radiation dose and the probability of harmful effects, meaning that as exposure increases, so does the risk of adverse outcomes. This concept is critical for understanding radiation safety standards and public health policies regarding exposure limits.