PURPOSE: To enable distinct discrimination of an IC card borne by a user or a third person in a state of the IC card being inserted, by using a transparent material for an outside case of an IC card fitting part.

CONSTITUTION: A measuring pulse of personal exposure measured by a radiation detector 5 is sent through an amplifier 6 and integrated by a single-chip computer 7. An IC card 2 is connected to this computer 7 through a contact terminal and all the personal information on a user recorded in the IC card 2 can be controlled thereby. For instance, the amount of the past exposure of the user is recorded therein and estimation is made as to whether the result of integration of this amount with the amount of the present exposure exceeds a control value of exposure or not. When the control value is exceeded, an alarm is issued from a buzzer 8. The IC card 2 can be fitted and removed. When the user leaves a radiation control area, accordingly, he removes the IC card 2 from a dosimeter and brings back only an IC card 9.