The Collaborative International Dictionary of English v.0.48:

dosimeter \dosimeter\ n.
   1. for measuring doses of .

   Syn: dosemeter.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

dosimeter \do*sim"et*er\, n. [NL. dosis dose + -meter.]
   a device for measuring doses of radiation, especially
   ionizing radiation such as X-rays, gamma rays, or ionizing
   particles.
   [PJC]

WordNet (r) 3.0 (2006):

dosimeter
    n 1: a measuring instrument for measuring doses of ionizing
         radiation (X-rays or radioactivity) [syn: dosemeter,
         dosimeter]