Characterization of NIS neutron irradiation facility for calibration and metrological application

In this study, the Neutron Irradiation Facility (NIF) of National Institute Standards (NIS) was characterized for metrological applications to improve accuracy calibration process. The NIS neutron irradiation facility consists a 5 Ci Am-Be and 0.1 μg Cf-252 sources. flux dose rate source calculated by using MCNP5 code simulation at different distances from source. delivered determined NM2-neutron monitor source-to-detector distances. A comparison between measured performed deviation them explained in skeletal arrangement room scattering contribution. shadow cone designed constructed determine contribution optimum source-distance used specified. It found that vary with about 10 7 –10 4 (n/cm 2 .S −1 ). rates were agreement up 150 cm distance center after which greater than calculated. measured-to-calculate ratio increased 7% 25% 300 cm. Moreover, standard should be each due higher value where combined uncertainty 4.04%.