How is dose estimated when a monitor is lost?

How is dose estimated when a monitor is lost?

• A. Using the most recent reading on the monitor
• B. Physicist estimates by averaging the last six months
• C. Using a departmental average
• D. No estimate can be made

Answer: (B)

When a dosimeter is lost, the dose is reconstructed by a qualified staff member who looks at the worker’s historical exposure data rather than relying on a single unread value. The common approach is for a physicist to average the last six months of dose records to estimate the current exposure. This method captures recent trends in how much the person has been exposed while smoothing out month-to-month fluctuations that a lone reading might exaggerate or miss. Relying on the most recent reading can be misleading if that value was affected by an unusual event or a temporary change in work activities. Using a departmental average ignores the individual’s actual exposure history and may under- or overestimate the person’s dose. If no estimate were possible, the record would be incomplete, which isn’t acceptable for safety tracking and regulatory purposes. The six-month average provides a reasonable, documented reconstruction that aligns with good radiation protection practice.

When a dosimeter is lost, the dose is reconstructed by a qualified staff member who looks at the worker’s historical exposure data rather than relying on a single unread value. The common approach is for a physicist to average the last six months of dose records to estimate the current exposure. This method captures recent trends in how much the person has been exposed while smoothing out month-to-month fluctuations that a lone reading might exaggerate or miss.

Relying on the most recent reading can be misleading if that value was affected by an unusual event or a temporary change in work activities. Using a departmental average ignores the individual’s actual exposure history and may under- or overestimate the person’s dose. If no estimate were possible, the record would be incomplete, which isn’t acceptable for safety tracking and regulatory purposes. The six-month average provides a reasonable, documented reconstruction that aligns with good radiation protection practice.