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Personnel Dosimetry
Wear your dosimeter at the collar, outside the apron, in fluoro. A declared pregnant worker adds a second one at the waist, under it.
The devices
A personnel dosimeter records the occupational dose you receive over a wear period, usually one month or one quarter. The OSL dosimeter is the most common. Its aluminum oxide strip is read by laser light, it measures doses as low as 0.01 mSv, and it can be reread. A TLD uses lithium fluoride crystals that give off light when heated. It is often used in ring badges, and heating erases the reading. Film badges are older, fog with heat and humidity, and miss doses below about 0.1 mSv. A direct ion storage (DIS) dosimeter holds a tiny ion chamber that can be read on demand. A pocket ionization chamber gives an immediate reading for short, high-exposure tasks.