Which risk model assumes that any radiation dose increases the risk of cancer proportionately?

The linear no-threshold risk model is the correct answer because it operates under the principle that any exposure to radiation, no matter how small, carries a risk of increasing cancer incidence. This model postulates a direct correlation between radiation dose and potential cancer risk, suggesting that even minimal exposure can contribute to the probability of developing cancer.

The essence of this model is that since there is no identified threshold level of exposure below which the risk is absent, the risk is assumed to escalate linearly as exposure increases. This approach is consistent with public health policies that emphasize the need to minimize exposure to radiation as a protective measure.

In contrast, the threshold risk model posits that there may be a level of exposure below which no adverse effects occur. The non-linear risk model incorporates varying risks at different exposure levels, leading to complexities in risk assessment. The adaptive risk model suggests that biological systems might adapt to certain levels of stress, including radiation, which would temporarily mitigate the risk. These perspectives diverge from the linear no-threshold model, which establishes a straightforward and continuous relationship between exposure and risk.