Analysis and comparison of monoenergetic fast neutron fluence determination using 238U samples at different positions with respect to the neutron source

Using two 238U samples placed in a gridded ionization chamber and a parallel-plate fission chamber, fluence of monoenergetic fast neutrons was determined. Four runs of measurements were performed. Analysis showed that although the neutron fluences for the two 238U samples differ by 20–33 times in the present work, the fluences at the position of the sample in the gridded ionization chamber determined by the two ways are in agreement within experimental uncertainties.

► Fluences of monoenergetic fast neutrons were determined in four runs.
► One 238U sample was placed in a gridded ionization chamber.
► Another 238U sample was placed in a parallel-plate fission chamber.
► Results are in agreement for different runs and different detectors.