Each required record of dose equivalent received by occupational workers must be kept (preserved):

• A. for one year
• B. for three years
• C. indefinitely
• D. there is no requirement

Answer: (C)

The main idea is that records of the dose-equivalent a worker has received should be preserved indefinitely. This creates a complete lifetime exposure history for each individual, which is essential for accurately assessing long-term health risk, verifying regulatory compliance, and enabling seamless transfer of records if the worker changes jobs or facilities. If the records were kept only for a short time, important data could be lost as careers span many years and different employers; later health evaluations or dose reconstructions would lack crucial information. Keeping these records forever ensures that the full accumulated exposure is always available for medical review, regulatory audits, and epidemiological analysis.