What is posted on Very High Radiation Areas and what is the sign?

• A. Danger
• B. Caution
• C. Warning
• D. Grave Danger

Answer: (D)

Very High Radiation Areas carry an extreme, life-threatening risk, so the signage must convey the strongest warning used in this context. Grave Danger communicates that level of severity clearly and immediately, signaling that exposure could be fatal and access should be tightly controlled and limited to authorized personnel with proper protective measures. The other terms suggest lower levels of hazard—Caution implies a minor risk, Warning indicates a serious but not life-threatening hazard, and Danger denotes a high hazard but not the most extreme level used here. So Grave Danger is the best fit for conveying the utmost level of risk in Very High Radiation Areas.