| Summary: | Background Measurement of uranium and plutonium content in the waste drum assay system (WDAS) is affected by the absorption of the matrix in the drum due to the neutron coincidence counting of waste. Purpose This study aims to propose a method for correcting neutron coincidence counting applicable to the classification detection of WDAS. Methods First of all, the calibration function between the absorption correction factor of the external neutron source and the sample in the waste drum was established. Then the coincidence neutron count of plutonium in the waste drum was corrected according the calibration function. Thereby the activity and quality of α waste were accurately measured. Finally, a 252Cf source was taken as external neutron source for experimental verification of neutron absorption correction of WDAS. Results Experimental results show the relative deviation between the corrected 252Cf activity and the standard value is significantly reduced, and the deviation of the experimental correction results is better than 7%. Conclusions The absorption correction method improves the accuracy of the results and provides the basis for the extension and application of the device.
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