American Registry of Radiologic Technologists (ARRT) Practice Exam

What type of dose-response curve do stochastic effects exhibit?

1. Inverse, threshold

2. Linear, non-threshold

3. Curved, non-linear

4. Quadratic, threshold

The correct answer is: Linear, non-threshold

Stochastic effects are a type of radiation effect characterized by a probability of occurrence that increases with dose, but without a threshold level below which the effect does not occur. The linear, non-threshold dose-response curve suggests that even the smallest dose of radiation can result in a certain probability of developing effects such as cancer or genetic mutations. As the dose increases, the risk of these stochastic effects also increases linearly, meaning that the relationship between dose and effect is direct and proportional. This is particularly important in radiation protection and safety protocols, as it emphasizes that there is no completely safe level of radiation exposure; even minimal exposure carries some risk of producing harmful effects. This understanding helps inform guidelines and regulations aimed at minimizing radiation exposure in medical and occupational settings.