Test of Accuracy of ISOCS Efficiency Calibration Without a Radioactive Source in Situ Measuring

It is verified that the accuracy of ISOCS efficiency calibration without a radioactive source in situ measuring by the experiment is adequate .For saturated body source model , the efficiency deviation between ISOCS calibration and actual measured at low , medium and high energy are respectively less than 7%,5%and 3%.For unsaturated wall , the nuclide activity deviation between ISOCS efficiency calculation and laboratory sampling measurement in low , medium and high energy are respectively less than 13%, 3%and 2.2%.The results show that ISOCS efficiency calibration method without a radioactive source is acceptable within a certain range deviation .