| Zhao Shi an,Ou Xiangming,Li Kaibao.A design of ambient dose equivalent dosimeter and its dosimetric performance[J].Chinese Journal of Radiological Medicine and Protection,1997,17(6):414-417 |
| A design of ambient dose equivalent dosimeter and its dosimetric performance |
| Received:September 05, 1997 Revised:October 30, 1997 |
| DOI： |
| KeyWords:Radiation protection dosimeter Ambient dose equivalent Ionizing chamber Energy response |
| FundProject:卫生部科学研究基金 |
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| Abstract:: |
| Objective To design an ambient dose equivalent dosimeter with digital display for radiation protection,which is based on the definition of the new operational radiation quantity for environmental monitoring—ambient dose equivalent recommended by the International Commission on Radiation Units and Measurements (ICRU) Report 39.Methods Considering the energy response of the instrument, the inner wall of ionizing chamber is coated with gum graphite added with a bit of metal powder.Results Using this chamber,measurement of H*(10) for photon radiation with unknown spectrum distribution is possible in the energy range from 47 keV to 230 keV with an uncertainty of better than 5%.The configuration,technology and dosimetric performance of the chamber and automatic functions of the reader are presented.Conclusion The ambient dose equivalent dosimeter can be used as not only a working reference dosimeter,but also a field dosimeter for radiation protection because the readings are expressed directly in ambient dose equivalent and averaged automatically in the period of measurement.Also, its power is supplied by battery for the portable purpose and the readings are displayed on the screen with light background for dim field. |
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