Many kinds of dosimeters are being used to evaluate the personal exposure doses in nuclear facilities, industrial plants, and hospitals. This report describes the accuracy and the error in measuring external doses by a variety of dosimeters in different facilities. The standard irradiation of dosimeters was carried out at the Electrotechnical Laboratory of the Ministry of International Trade and Industry, and the measurement of doses was done by the film-service section in each facility.
The precision of both film badge and glass dosimeter systems under the best condition was about 3% standard deviation in the range of dose from 100mR to 500mR. The film badge was more precise than the glass dosimeter at lower dose (less than 100mR), whereas the glass dosimeter gave better results at higher dose (more than 1000mR). Only two types of thermo-luminescent dosimeters were tested, therefore, the precision of the thermo-luminescent dosimeter system was not given clearly in this report. The study on the accuracy of this system is continuing.
