Which statement about EfD limits is true?

• A. They prevent teratogenic effects
• B. They minimize acute radiation syndrome risk
• C. They minimize stochastic effects
• D. They prevent deterministic effects

Answer: (C)

Effective dose limits are about reducing the chances of long-term, probabilistic health effects from radiation, mainly cancer. It does this by summing the doses to different tissues, each weighted by how sensitive that tissue is to radiation-induced cancer risk. This single metric lets regulators and clinicians compare different exposures and keep overall risk as low as reasonably achievable. It isn’t focused on preventing teratogenic effects, nor on preventing acute radiation syndrome, which require avoiding very high doses. Nor is it primarily about stopping deterministic effects, which have specific dose thresholds for particular organs. In short, the purpose of EfD limits is to minimize stochastic (cancer-related) effects.