Occupational and Public Dose Control, ALARA, and Monitoring
Core concepts
Understand personnel monitoring (TLD, OSL, film badges), dosimeter placement (whole-body, extremity, collar), and the meaning of minimum detectable dose. Know the ALARA process: management commitment, dose constraints, investigation levels, and dose-reduction techniques (time, distance, shielding). Understand public dose control: effluent monitoring, release criteria, and the 1 mSv/y limit. Know the concepts of collective dose, dose constraints, and the difference between monitoring and surveillance.
Traps
Questions test dosimeter placement and the fact that badges measure dose at the location worn-not necessarily whole-body dose. Don't confuse investigation levels with regulatory limits. Watch for the distinction between external monitoring and bioassay (internal). Remember that ALARA uses dose constraints below regulatory limits. A common trap is that a declared pregnant worker's dosimeter should be worn at the abdomen.
Worked example / rule of thumb
If a worker's annual dose is 8 mSv and the constraint is 10 mSv, they are within ALARA but should investigate trends. Rule of thumb: set investigation levels well below limits (e.g., 10% of limit) to trigger review.