Fast neutron calibration fields constructed using a proton accelerator of KIRAMS and spectrumweighted response of various neutron detectors.

This paper presents the dosimetric quantities, realistic neutron calibration fields and spectrum-weighted response (SWR) of several neutron-measuring devices to provide guidance to health physicists and dosimetry specialists on the proper selection and use of survey meters in neutron fields of varying energy spectra. To yield the SWR, the detector response functions of 17 neutron-measuring devices were numerically folded with each of the produced calibration neutron spectra through the in-house developed software K-SWR. The detectors response functions were taken from the IAEA Technical Reports Series No. 403. Eight kinds of calibration neutron fields with high energy and high dose rates were produced using a proton accelerator (MC50 cyclotron) of Korea Institute of Radiological and Medical Sciences (KIRAMS). The fluence-average energy (E-ave) varied from 3.8 to 16.9 MeV, and the ambient-dose-equivalent rate [H(10) h(1)] varied from 0.99 to 16.5 mSv h(1).