Study on setting up the process of assessment of internal dose using the Accuscan whole body counter model 2260

Assessment of internal dose based on the in vivo technique by using the whole body counter (WBC) is a new approach relating to the field of internal dosimetry in Vietnam (besides the in vitro technique based on analyzing biological samples was applied). The Accuscan Bed WBC Model 2260 is the first equipment in Vietnam which was invested and set up at the Institute for Nuclear Science and Technology (INST) on November 2013. In 2014, our dosimetry laboratory belong to the Center for Radiation Protection - INST carried on studying about assessment of internal dose for radiation workers based on this WBC. Within the study, we want to describe the functions of this WBC, display some results of experiment during the process of equipment operation and calibration in order that this equipment operates with efficiency the same as at factory; the experiment in order to determine minimum detectable activity (MDA); and determine activity of some standard radiation sources (Ba¹³³, Mock I¹³¹, K-IAEA.RGK-1) with relative deviation about 2.3 - 6.6 %; this study provides the process of assessment of internal dose by using WBC. (author)