Radcal 2026C X-Ray CT Dental Radiation Monitor Dosimeter Controller WORKING Radiation Monitor Controller Made by Radcal Model: 2026C A Dosimeter is an instrument that measures the amount of hazardous material to which something or someone has been cumulatively exposed. The most common is the radiation dosimeter, which measures a person's or object's exposure to radiation. The unit is used for Radiography, Fluoroscopy, Mammography, CT, Dental and Survey.