1) Dosimeter 2) Measuring device 3) Measuring instrument 4) Measuring system 5) Radiation measurer 1) Dosimeter 
a radiation meter intended measure absorbed dose NOTE - In a wider sense this term is also used in exposure measurement. This use is deprecated.
An instrument worn by a person during normal daily work routines which is designed to continuously measure noise exposure.
[n] - a measuring instrument for measuring doses of ionizing radiation (X-rays or radioactivity)
dosimeter, dosemeter 1. An instrument that measures and indicates the amount of x-rays or radiation absorbed in a given period. 2. A device carried by a person for measuring the quantity of ionizing radiation; such as, gamma rays, to which one has been exposed.
dosimeter noun a measuring instrument for measuring doses of ionizing radiation (X-rays or radioactivity)