Calibration of a neutron dose rate meter in various neutron standard fields

This paper presents the calibration of a neutron dose rate meter and the evaluation of its calibration factors（CFs）in several neutron standard fields(i.e.,two standard fields with bare sources of;Cf and;Am-Be,and five simulated workplace fields with;Am-Be moderated sources).The calibration in standard fields with bare sources was conducted by following the recommendations of the ISO 8529 standard.The measured total neutron ambient dose equivalent rates,denoted as■,were analyzed to obtain direct components,denoted as■,using a reduced fitting method.The CF was then calculated as the ratio between the conventional true value of the neutron ambient dose equivalent rate in a free field,denoted as■,and the value of■.In contrast,in the simulated workplace neutron fields,the calibration of the neutron dose rate meter was conducted by following the ISO 12789 standard.The CF was calculated as the ratio between the values of■measured by a standard instrument（i.e.,Bonner sphere spectrometer）and the neutron dose rate meter.The CF values were obtained in the range of 0.88–1.0.The standard uncertainties■of the CFs were determined to be in the range of approximately 6.6–13.1%.