When is occupational monitoring required?

• A. Only for visitors
• B. When the person may receive one-tenth of the recommended dose limit
• C. Only during initial training
• D. Only after a radiologic incident

Answer: (B)

Occupational monitoring is used when there is a real possibility that a worker’s exposure could approach a significant portion of the allowed annual dose. In many standards, the occupational limit is about 50 mSv per year, so monitoring is triggered if a worker could receive roughly 5 mSv in a year (one-tenth of the limit). Having dosimeters and keeping records in these cases lets you quantify actual doses, verify compliance with limits, and apply ALARA by adjusting procedures, shielding, or duties if necessary. It also creates the dose history needed for medical surveillance and regulatory reporting.

Visitors typically don’t require ongoing monitoring because their potential exposure is usually much lower; monitoring isn’t limited to initial training or to post-incident response, though incident investigations can lead to additional monitoring if exposures are a concern.