Which means there is a safe level of radiation for certain effects and those effects are directly proportional to the dose received when the safe level is exceeded?

Which means there is a safe level of radiation for certain effects and those effects are directly proportional to the dose received when the safe level is exceeded?

• A. Nonlinear-nonthreshold
• B. Linear-threshold
• C. Linear-nonthreshold
• D. Nonlinear-threshold

Answer: (B)

In radiation dose–response concepts, a safe exposure level followed by a straight-line increase in effect with dose is described by the linear-threshold model. It means there is a threshold dose below which no deterministic effect occurs, and once that threshold is exceeded, the likelihood or severity of the effect increases proportionally with additional dose. This fits the description of having a safe level and a direct, linear rise in risk after that point. If the relationship were linear-nonthreshold, any amount of exposure would carry some risk, with no safe level. If it were nonlinear-threshold, the increase after crossing the threshold would not be a straight line. If it were nonlinear-nonthreshold, there would be no safe level and the rise with dose would be curved.

In radiation dose–response concepts, a safe exposure level followed by a straight-line increase in effect with dose is described by the linear-threshold model. It means there is a threshold dose below which no deterministic effect occurs, and once that threshold is exceeded, the likelihood or severity of the effect increases proportionally with additional dose. This fits the description of having a safe level and a direct, linear rise in risk after that point.

If the relationship were linear-nonthreshold, any amount of exposure would carry some risk, with no safe level. If it were nonlinear-threshold, the increase after crossing the threshold would not be a straight line. If it were nonlinear-nonthreshold, there would be no safe level and the rise with dose would be curved.