Abstract: In this paper, a nuclear facility on-site calibration system consisting of a small-scale controllable neutron source and a neutron dose reference instrument is used to obtain the calibration coefficient through the ratio of the response of the instrument to be calibrated and the reference instrument to the neutron emission of the neutron tube in a symmetrical position. In order to complete the transfer of the instrument’s ambient dose equivalent calibration coefficient from the reference radiation field of the National Standards Metrology and Calibration Center to the nuclear facility site, the calibration coefficient must be energy corrected. Am-Be neutron source was used to simulate the radiation field inside the nuclear facility, the on-site calibration experiments of neutron dose instruments were performed, and compared with the measurement results of the calibrated multi-sphere neutron spectrometer. The results have shown that: if the measurement results of the instrument to be calibrated were calibrated using an uncorrected calibration coefficient, the relative deviation of the ambient dose equivalent rate was 17.0%; while if the measurement results of the instrument to be calibrated were calibrated using the corrected calibration coefficient, the relative deviation of the ambient dose equivalent rate would be -2.4%.

Key words: neutron dose, instrument calibration, energy correction, radiation measurement, on-site calibration